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His best known mathematical work is the formula for the area of a triangle in terms of the lengths of its sides." /> <meta name="twitter:image" content="https://mathshistory.st-andrews.ac.uk/Biographies/Heron/thumbnail.jpg" /> </head> <body> <div class="container">   <header class="site-header py-3 position-relative">  <a class="skip-link" href="#main">Skip to content</a> <div class="row flex-nowrap justify-content-between align-items-center"> <div class="col pt-1"> <a class="site-header-name text-decoration-none" href="../../" > <h1 class="site-header-name"> <img height="48" src="../../static/img/logo.png" alt="MacTutor logo" /> MacTutor </h1> </a> </div> </div>  </header>   <div class="container nav-bar" role="navigation"> <div class="row nav"> <a class="col-md-auto p-2" href="../../">Home</a> <a class="col-md-auto p-2" href="../">Biographies</a> <a class="col-md-auto p-2" href="../../HistTopics/">History Topics</a> <a class="col-md-auto p-2" href="../../Map/">Map</a> <a class="col-md-auto p-2" href="../../Curves/">Curves</a> <a class="col-md-auto p-2" href="../../Search/">Search</a> </div> </div>   <main id="main"> <div class="row"> <div class="col-md-12"> <h1>Heron of Alexandria</h1> </div> </div> <hr /> <div class="row"> <div class="col-md-8"> <h3>Quick Info</h3> <dt>Born</dt> <dd> about AD 10 <a href="../../Map/#Alexandria" target="_blank" > (possibly) Alexandria, Egypt </a > </dd> <dt>Died</dt> <dd> about AD 75 </dd> <hr /> <dt>Summary</dt> <dd>Heron or Hero of Alexandria was an important geometer and worker in mechanics who invented many machines including a steam turbine. His best known mathematical work is the formula for the area of a triangle in terms of the lengths of its sides.</dd> </div> <div class="col-md-4 biography-thumbnail-container"> <a href="pictdisplay/" target="_blank"> <img class="biography-thumbnail" src="thumbnail.jpg" alt="Thumbnail of Heron of Alexandria" /> View two larger pictures</a > </div> </div> <hr /> <div class="row"> <div class="col-md-12"> <h3>Biography</h3> Sometimes called Hero, Heron of Alexandria was an important geometer and worker in mechanics. Perhaps the first comment worth making is how common the name Heron was around this time and it is a difficult problem in the history of mathematics to identify which references to Heron are to the mathematician described in this article and which are to others of the same name. There are additional problems of identification which we discuss below. A major difficulty regarding Heron was to establish the date at which he lived. There were two main schools of thought on this, one believing that he lived around 150 BC and the second believing that he lived around 250 AD. The first of these was based mainly on the fact that Heron does not quote from any work later than <a class="mlink" data-popup="../Archimedes/popup/" href="../Archimedes/">Archimedes</a>. The second was based on an argument which purported to show that he lived later that <a class="mlink" data-popup="../Ptolemy/popup/" href="../Ptolemy/">Ptolemy</a>, and, since <a class="mlink" data-popup="../Pappus/popup/" href="../Pappus/">Pappus</a> refers to Heron, before <a class="mlink" data-popup="../Pappus/popup/" href="../Pappus/">Pappus</a>. Both of these arguments have been shown to be wrong. There was a third date proposed which was based on the belief that Heron was a contemporary of Columella. Columella was a Roman soldier and farmer who wrote extensively on agriculture and similar subjects, hoping to foster in people a love for farming and a liking for the simple life. Columella, in a text written in about 62 AD [<a class="reference" data-popup='T L Heath, A history of Greek mathematics I, II (Oxford, 1931).' href="#reference-5">5</a>]:- <blockquote>... gave measurements of plane figures which agree with the formulas used by Heron, notably those for the equilateral triangle, the regular hexagon (in this case not only the formula but the actual figures agree with Heron's) and the segment of a circle which is less than a semicircle ...</blockquote> However, most historians believed that both Columella and Heron were using an earlier source and claimed that the similarity did not prove any dependence. We now know that those who believed that Heron lived around the time of Columella were in fact correct, for <a class="mlink" data-popup="../Neugebauer/popup/" href="../Neugebauer/">Neugebauer</a> in 1938 discovered that Heron referred to a recent eclipse in one of his works which, from the information given by Heron, he was able to identify with one which took place in Alexandria at 23.00 hours on 13 March 62. From Heron's writings it is reasonable to deduce that he taught at the Museum in Alexandria. His works look like lecture notes from courses he must have given there on mathematics, physics, pneumatics, and mechanics. Some are clearly textbooks while others are perhaps drafts of lecture notes not yet worked into final form for a student textbook. <a class="mlink" data-popup="../Pappus/popup/" href="../Pappus/">Pappus</a> describes the contribution of Heron in Book VIII of his Mathematical Collection. <a class="mlink" data-popup="../Pappus/popup/" href="../Pappus/">Pappus</a> writes (see for example [<a class="reference" data-popup='I Thomas, Selections illustrating the history of Greek mathematics II (London, 1941).' href="#reference-8">8</a>]):- <blockquote>The mechanicians of Heron's school say that mechanics can be divided into a theoretical and a manual part; the theoretical part is composed of geometry, arithmetic, astronomy and physics, the manual of work in metals, architecture, carpentering and painting and anything involving skill with the hands. ... the ancients also describe as mechanicians the wonder-workers, of whom some work by means of pneumatics, as Heron in his Pneumatica, some by using strings and ropes, thinking to imitate the movements of living things, as Heron in his Automata and Balancings, ... or by using water to tell the time, as Heron in his Hydria, which appears to have affinities with the science of sundials.</blockquote> A large number of works by Heron have survived, although the authorship of some is disputed. We will discuss some of the disagreements in our list of Heron's works below. The works fall into several categories, technical works, mechanical works and mathematical works. The surviving works are: <ol><li 1="">On the dioptra dealing with <a class="gllink" data-popup="../../Glossary/theodolite/" href="../../Glossary/#theodolite">theodolites</a> and surveying. It contains a chapter on astronomy giving a method to find the distance between Alexandria and Rome using the difference between local times at which an eclipse of the moon is observed at each cities. The fact that <a class="mlink" data-popup="../Ptolemy/popup/" href="../Ptolemy/">Ptolemy</a> does not appear to have known of this method led historians to mistakenly believe Heron lived after <a class="mlink" data-popup="../Ptolemy/popup/" href="../Ptolemy/">Ptolemy</a>; </li><li 2="">The pneumatica in two books studying mechanical devices worked by air, steam or water pressure. It is described in more detail below; </li><li 3="">The automaton theatre describing a puppet theatre worked by strings, drums and weights; </li><li 4="">Belopoeica describing how to construct engines of war. It has some similarities with work by <a class="mlink" data-popup="../Philon/popup/" href="../Philon/">Philon</a> and also work by <a class="mlink" data-popup="../Vitruvius/popup/" href="../Vitruvius/">Vitruvius</a> who was a Roman architect and engineer who lived in the 1st century BC; </li><li 5="">The cheirobalistra about catapults is thought to be part of a dictionary of catapults but was almost certainly not written by Heron; </li><li 6="">Mechanica in three books written for architects and described in more detail below; </li><li 7="">Metrica which gives methods of measurement. We give more details below; </li><li 8="">Definitiones contains 133 definitions of geometrical terms beginning with points, lines etc. In [<a class="reference" data-popup="W R Knorr, 'Arithmêtikê stoicheiôsis' : on Diophantus and Hero of Alexandria, Historia Math. 20 (2) (1993), 180-192." href="#reference-15">15</a>] <a class="mlink" data-popup="../Knorr/popup/" href="../Knorr/">Knorr</a> argues convincingly that this work is in fact due to <a class="mlink" data-popup="../Diophantus/popup/" href="../Diophantus/">Diophantus</a>; </li><li 9="">Geometria seems to be a different version of the first chapter of the Metrica based entirely on examples. Although based on Heron's work it is not thought to be written by him; </li><li 10="">Stereometrica measures three-dimensional objects and is at least in part based on the second chapter of the Metrica again based on examples. Again it is though to be based on Heron's work but greatly changed by many later editors; </li><li 11="">Mensurae measures a whole variety of different objects and is connected with parts of Stereometrica and Metrica although it must be mainly the work of a later author; </li><li 12="">Catoptrica deals with mirrors and is attributed by some historians to <a class="mlink" data-popup="../Ptolemy/popup/" href="../Ptolemy/">Ptolemy</a> although most now seem to believe that this is a genuine work of Heron. In this work, Heron states that vision results from light rays emitted by the eyes. He believes that these rays travel with infinite velocity. </li></ol> Let us examine some of Heron's work in a little more depth. Book I of his treatise Metrica deals with areas of triangles, quadrilaterals, regular polygons of between 3 and 12 sides, surfaces of cones, cylinders, prisms, pyramids, spheres etc. A method, known to the Babylonians 2000 years before, is also given for approximating the square root of a number. Heron gives this in the following form (see for example [<a class="reference" data-popup='T L Heath, A history of Greek mathematics I, II (Oxford, 1931).' href="#reference-5">5</a>]):- <blockquote>Since 720 has not its side <a class="gllink" data-popup="../../Glossary/rational/" href="../../Glossary/#rational">rational</a>, we can obtain its side within a very small difference as follows. Since the next succeeding <a class="gllink" data-popup="../../Glossary/square_number/" href="../../Glossary/#square_number">square number</a> is 729, which has 27 for its side, divide 720 by 27. This gives <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>26</mn><mstyle mathsize="1.2em"><mfrac><mn>2</mn><mn>3</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">26\large\frac{2}{3}\normalsize</annotation></semantics></math>2632. Add 27 to this, making <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>53</mn><mstyle mathsize="1.2em"><mfrac><mn>2</mn><mn>3</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">53\large\frac{2}{3}\normalsize</annotation></semantics></math>5332, and take half this or <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>26</mn><mstyle mathsize="1.2em"><mfrac><mn>5</mn><mn>6</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">26\large\frac{5}{6}\normalsize</annotation></semantics></math>2665. The side of 720 will therefore be very nearly <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>26</mn><mstyle mathsize="1.2em"><mfrac><mn>5</mn><mn>6</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">26\large\frac{5}{6}\normalsize</annotation></semantics></math>2665. In fact, if we multiply <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>26</mn><mstyle mathsize="1.2em"><mfrac><mn>5</mn><mn>6</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">26\large\frac{5}{6}\normalsize</annotation></semantics></math>2665 by itself, the product is <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>720</mn><mstyle mathsize="1.2em"><mfrac><mn>1</mn><mn>36</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">720\large\frac{1}{36}\normalsize</annotation></semantics></math>720361, so the difference in the square is <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mstyle mathsize="1.2em"><mfrac><mn>1</mn><mn>36</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">\large\frac{1}{36}\normalsize</annotation></semantics></math>361. If we desire to make the difference smaller still than <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mstyle mathsize="1.2em"><mfrac><mn>1</mn><mn>36</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">\large\frac{1}{36}\normalsize</annotation></semantics></math>361, we shall take <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>720</mn><mstyle mathsize="1.2em"><mfrac><mn>1</mn><mn>36</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">720\large\frac{1}{36}\normalsize</annotation></semantics></math>720361 instead of 729 (or rather we should take <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>26</mn><mstyle mathsize="1.2em"><mfrac><mn>5</mn><mn>6</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">26\large\frac{5}{6}\normalsize</annotation></semantics></math>2665 instead of 27), and by proceeding in the same way we shall find the resulting difference much less than <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mstyle mathsize="1.2em"><mfrac><mn>1</mn><mn>36</mn></mfrac><mstyle mathsize="1em"></mstyle></mstyle></mrow><annotation encoding="application/x-tex">\large\frac{1}{36}\normalsize</annotation></semantics></math>361.</blockquote> Heron also proves his famous formula in Book I of the Metrica :- <blockquote>if A is the area of a triangle with sides a, b and c and <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>s</mi><mo>=</mo><mstyle mathsize="1.2em"><mfrac><mn>1</mn><mn>2</mn></mfrac><mstyle mathsize="1em"><mo stretchy="false">(</mo><mi>a</mi><mo>+</mo><mi>b</mi><mo>+</mo><mi>c</mi><mo stretchy="false">)</mo></mstyle></mstyle></mrow><annotation encoding="application/x-tex">s = \large\frac{1}{2}\normalsize (a + b + c)</annotation></semantics></math>s=21(a+b+c) then <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msup><mi>A</mi><mn>2</mn></msup><mo>=</mo><mi>s</mi><mo stretchy="false">(</mo><mi>s</mi><mo>−</mo><mi>a</mi><mo stretchy="false">)</mo><mo stretchy="false">(</mo><mi>s</mi><mo>−</mo><mi>b</mi><mo stretchy="false">)</mo><mo stretchy="false">(</mo><mi>s</mi><mo>−</mo><mi>c</mi><mo stretchy="false">)</mo></mrow><annotation encoding="application/x-tex">A^{2} = s (s - a)(s - b)(s - c)</annotation></semantics></math>A2=s(s−a)(s−b)(s−c).</blockquote> In Book II of Metrica, Heron considers the measurement of volumes of various three dimensional figures such as spheres, cylinders, cones, prisms, pyramids etc. His preface is interesting, partly because knowledge of the work of <a class="mlink" data-popup="../Archimedes/popup/" href="../Archimedes/">Archimedes</a> does not seem to be as widely known as one might expect (see for example [<a class="reference" data-popup='T L Heath, A history of Greek mathematics I, II (Oxford, 1931).' href="#reference-5">5</a>]):- <blockquote>After the measurement of surfaces, rectilinear or not, it is proper to proceed to solid bodies, the surfaces of which we have already measured in the preceding book, surfaces plane and spherical, conical and cylindrical, and irregular surfaces as well. The methods of dealing with these solids are, in view of their surprising character, referred to <a class="mlink" data-popup="../Archimedes/popup/" href="../Archimedes/">Archimedes</a> by certain writers who give the traditional account of their origin. But whether they belong to <a class="mlink" data-popup="../Archimedes/popup/" href="../Archimedes/">Archimedes</a> or another, it is necessary to give a sketch of these results as well.</blockquote> Book III of Metrica deals with dividing areas and volumes according to a given ratio. This was a problem which <a class="mlink" data-popup="../Euclid/popup/" href="../Euclid/">Euclid</a> investigated in his work On divisions of figures and Heron's Book III has a lot in common with the work of <a class="mlink" data-popup="../Euclid/popup/" href="../Euclid/">Euclid</a>. Also in Book III, Heron gives a method to find the cube root of a number. In particular Heron finds the cube root of 100 and the authors of [<a class="reference" data-popup='G Deslauriers and S Dubuc, Le calcul de la racine cubique selon Héron, Elem. Math. 51 (1) (1996), 28-34.' href="#reference-9">9</a>] give a general formula for the cube root of <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>N</mi></mrow><annotation encoding="application/x-tex">N</annotation></semantics></math>N which Heron seems to have used in his calculation: <div class="indent-paragraph"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>a</mi><mo>+</mo><mstyle mathsize="1.44em"><mfrac><mrow><mi>b</mi><mi>d</mi></mrow><mrow><mi>b</mi><mi>d</mi><mo>+</mo><mi>a</mi><mi>D</mi></mrow></mfrac><mstyle mathsize="1em"><mo stretchy="false">(</mo><mi>b</mi><mo>−</mo><mi>a</mi><mo stretchy="false">)</mo></mstyle></mstyle></mrow><annotation encoding="application/x-tex">a + \Large \frac {b d}{b d + aD} \normalsize(b - a)</annotation></semantics></math>a+bd+aDbd(b−a), where <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msup><mi>a</mi><mn>3</mn></msup><mo><</mo><mi>N</mi><mo><</mo><msup><mi>b</mi><mn>3</mn></msup><mo separator="true">,</mo><mi>d</mi><mo>=</mo><mi>N</mi><mo>−</mo><msup><mi>a</mi><mn>3</mn></msup><mo separator="true">,</mo><mi>D</mi><mo>=</mo><msup><mi>b</mi><mn>3</mn></msup><mo>−</mo><mi>N</mi></mrow><annotation encoding="application/x-tex">a^{3} < N < b^{3}, d = N - a^{3}, D = b^{3} - N</annotation></semantics></math>a3<N<b3,d=N−a3,D=b3−N.</div> In [<a class="reference" data-popup='G Deslauriers and S Dubuc, Le calcul de la racine cubique selon Héron, Elem. Math. 51 (1) (1996), 28-34.' href="#reference-9">9</a>] it is remarked that this is a very accurate formula, but, unless a Byzantine copyist is to be blamed for an error, they conclude that Heron might have borrowed this accurate formula without understanding how to use it in general. The Pneumatica is a strange work which is written in two books, the first with 43 chapters and the second with 37 chapters. Heron begins with a theoretical consideration of pressure in fluids. Some of this theory is right but, not surprisingly, some is quite wrong. Then there follows a description of a whole collection of what might best be described as mechanical toys for children [<a class="reference" data-popup='A G Drachmann, M S Mahoney, Biography in Dictionary of Scientific Biography (New York 1970-1990). See <a href="http://www.encyclopedia.com/doc/1G2-2830901965.html">THIS LINK</a>.' href="#reference-1">1</a>]:- <blockquote>Trick jars that give out wine or water separately or in constant proportions, singing birds and sounding trumpets, puppets that move when a fire is lit on an altar, animals that drink when they are offered water ...</blockquote> Although all this seems very trivial for a scientist to be involved with, it would appear that Heron is using these toys as a vehicle for teaching physics to his students. It seems to be an attempt to make scientific theories relevant to everyday items that students of the time would be familiar with. There is, rather remarkably, descriptions of over 100 machines such as a fire engine, a wind organ, a coin-operated machine, and a steam-powered engine called an aeolipile. Heron's aeolipile, which has much in common with a jet engine, is described in [<a class="reference" data-popup='Biography in Encyclopaedia Britannica. <a href="http://www.britannica.com/biography/Heron-of-Alexandria">http://www.britannica.com/biography/Heron-of-Alexandria</a>' href="#reference-2">2</a>] as follows:- <blockquote>The aeolipile was a hollow sphere mounted so that it could turn on a pair of hollow tubes that provided steam to the sphere from a cauldron. The steam escaped from the sphere from one or more bent tubes projecting from its equator, causing the sphere to revolve. The aeolipile is the first known device to transform steam into rotary motion.</blockquote> Heron wrote a number of important treatises on mechanics. They give methods of lifting heavy weights and describe simple mechanical machines. In particular the Mechanica is based quite closely on ideas due to <a class="mlink" data-popup="../Archimedes/popup/" href="../Archimedes/">Archimedes</a>. Book I examines how to construct three dimensional shapes in a given proportion to a given shape. It also examines the theory of motion, certain statics problems, and the theory of the balance. In Book II Heron discusses lifting heavy objects with a lever, a pulley, a wedge, or a screw. There is a discussion on centres of gravity of plane figures. Book III examines methods of transporting objects by such means as sledges, the use of cranes, and looks at wine presses. Other works have been attributed to Heron, and for some of these we have fragments, for others there are only references. The works for which fragments survive include one on Water clocks in four books, and Commentary on <a class="mlink" data-popup="../Euclid/popup/" href="../Euclid/">Euclid</a>'s Elements which must have covered at least the first eight books of the Elements. Works by Heron which are referred to, but no trace survives, include Camarica or On vaultings which is mentioned by <a class="mlink" data-popup="../Eutocius/popup/" href="../Eutocius/">Eutocius</a> and Zygia or On balancing mentioned by <a class="mlink" data-popup="../Pappus/popup/" href="../Pappus/">Pappus</a>. Also in the Fihrist, a tenth century survey of Islamic culture, a work by Heron on how to use an <a class="gllink" data-popup="../../Glossary/astrolabe/" href="../../Glossary/#astrolabe">astrolabe</a> is mentioned. Finally it is interesting to look at the opinions that various writers have expressed as to the quality and importance of Heron. <a class="mlink" data-popup="../Neugebauer/popup/" href="../Neugebauer/">Neugebauer</a> writes [<a class="reference" data-popup='O Neugebauer, A history of ancient mathematical astronomy (New York, 1975).' href="#reference-7">7</a>]:- <blockquote>The decipherment of the mathematical cuneiform texts made it clear that much of the "Heronic" type of Greek mathematics is simply the last phase of the Babylonian mathematical tradition which extends over 1800 years.</blockquote> Some have considered Heron to be an ignorant artisan who copied the contents of his books without understanding what he wrote. This in particular has been levelled against the Pneumatica but Drachmann, writing in [<a class="reference" data-popup='A G Drachmann, M S Mahoney, Biography in Dictionary of Scientific Biography (New York 1970-1990). See <a href="http://www.encyclopedia.com/doc/1G2-2830901965.html">THIS LINK</a>.' href="#reference-1">1</a>], says:- <blockquote>... to me the free flowing, rather discursive style suggests a man well versed in his subject who is giving a quick summary to an audience that knows, or who might be expected to know, a good deal about it.</blockquote> Some scholars have approved of Heron's practical skills as a surveyor but claimed that his knowledge of science was negligible. However, Mahony writes in [<a class="reference" data-popup='A G Drachmann, M S Mahoney, Biography in Dictionary of Scientific Biography (New York 1970-1990). See <a href="http://www.encyclopedia.com/doc/1G2-2830901965.html">THIS LINK</a>.' href="#reference-1">1</a>]:- <blockquote>In the light of recent scholarship, he now appears as a well-educated and often ingenious applied mathematician, as well as a vital link in a continuous tradition of practical mathematics from the Babylonians, through the Arabs, to Renaissance Europe.</blockquote> Finally <a class="mlink" data-popup="../Heath/popup/" href="../Heath/">Heath</a> writes in [<a class="reference" data-popup='T L Heath, A history of Greek mathematics I, II (Oxford, 1931).' href="#reference-5">5</a>]:- <blockquote>The practical utility of Heron's manuals being so great, it was natural that they should have great vogue, and equally natural that the most popular of them at any rate should be re-edited, altered and added to by later writers; this was inevitable with books which, like the "Elements" of <a class="mlink" data-popup="../Euclid/popup/" href="../Euclid/">Euclid</a>, were in regular use in Greek, Byzantine, Roman, and Arabian education for centuries.</blockquote> </div> </div> <hr /> <div class="row mt-2"> <div class="col-md-12"> <a href="../../Countries/Egypt/" >Other Mathematicians born in Egypt</a > <a href="poster/lived/" >A Poster of Heron of Alexandria</a > </div> </div> <hr/> <div class="row"> <div class="col-md-12"> <h3>References (<a href="#" id="references-toggle">show</a>)</h3> </div> </div> <div class="row" id="references-list"> <div class="col-md-12"> <ol name="references"> <li id="reference-1">A G Drachmann, M S Mahoney, Biography in Dictionary of Scientific Biography (New York 1970-1990). See <a href="http://www.encyclopedia.com/doc/1G2-2830901965.html">THIS LINK</a>.</li> <li id="reference-2">Biography in Encyclopaedia Britannica. <a href="http://www.britannica.com/biography/Heron-of-Alexandria">http://www.britannica.com/biography/Heron-of-Alexandria</a></li> <li id="reference-3">M Cantor, Vorlesungen über Geschichte der Mathematik I (Leipzig, 1908).</li> <li id="reference-4">A G Drachmann, Ktesibios, Philon, and Heron, a Study in Ancient Pneumatics (1948).</li> <li id="reference-5">T L Heath, A history of Greek mathematics I, II (Oxford, 1931).</li> <li id="reference-6">J L Heiberg, Heronis Alexandrini Opera quae supersunt omnia (Leipzig, 1912).</li> <li id="reference-7">O Neugebauer, A history of ancient mathematical astronomy (New York, 1975).</li> <li id="reference-8">I Thomas, Selections illustrating the history of Greek mathematics II (London, 1941).</li> <li id="reference-9">G Deslauriers and S Dubuc, Le calcul de la racine cubique selon Héron, Elem. Math. 51 (1) (1996), 28-34.</li> <li id="reference-10">A G Drachmann, Fragments from Archimedes in Heron's Mechanics, Centaurus 8 (1963), 91-146.</li> <li id="reference-11">A G Drachmann, Heron and Ptolemaios, Centaurus 1 (1950), 117-131.</li> <li id="reference-12">M Federspiel, Sur un passage des 'Definitiones' du pseudo-Héron d'Alexandrie, Rev. Histoire Sci. Appl. 32 (2) (1979), 97-106.</li> <li id="reference-13">J Hoyrup, The position of Heron's formula in the Metrica (with a note about Plato) (Italian), Boll. Storia Sci. Mat. 17 (1) (1997), 3-11.</li> <li id="reference-14">P Keyser, A new look at Heron's 'steam engine', Arch. Hist. Exact Sci. 44 (2) (1992), 107-124.</li> <li id="reference-15">W R Knorr, 'Arithmêtikê stoicheiôsis' : on Diophantus and Hero of Alexandria, Historia Math. 20 (2) (1993), 180-192.</li> <li id="reference-16">J G Smyly, Square roots in Heron of Alexandria, Hermathena 63 (1944), 18-26.</li> <li id="reference-17">C M Taisbak, An Archimedean proof of Heron's formula for the area of a triangle; reconstructed, Centaurus 24 (1980), 110-116.</li> <li id="reference-18">C M Taisbak, Errata: An Archimedean proof of Heron's formula for the area of a triangle; reconstructed, Centaurus 25 (1-2) (1981/82), 160.</li> <li id="reference-19">Y Id and E S Kennedy, A medieval proof of Heron's formula, Math. Teacher 62 (1969), 585-587.</li> </ol> </div> </div> <hr/> <div class="row"> <div class="col-md-12"> <h3>Additional Resources (<a href="#" id="additional-toggle">show</a>)</h3> </div> </div> <div class="row" id="additional-list"> <div class="col-md-6"> Other pages about Heron of Alexandria: <ol name="additional"> <li><a href="../../Timelines/timelinea.html">See Heron of Alexandria on a timeline</a></li> <li><a href="../../Extras/MinimalPaths2/">Minimal paths</a></li> <li><a href="../../Extras/Rose_literature/">Herbert Jennings Rose's Greek mathematical literature</a></li> <li><a href="../../Miller/stamps/#Heron">Miller's postage stamps</a></li> <li><a href="../../Strick/heron.pdf">Heinz Klaus Strick biography</a></li> </ol> </div> <div class="col-md-6"> Other websites about Heron of Alexandria: <ol name="otherweb"> <li><a href="http://www.encyclopedia.com/doc/1G2-2830901965.html" target="_blank">Dictionary of Scientific Biography</a></li> <li><a href="http://www.britannica.com/biography/Heron-of-Alexandria" target="_blank">Encyclopaedia Britannica</a></li> <li><a href="http://www.nndb.com/people/898/000103589/" target="_blank">NNDB</a></li> <li><a href="http://mathpages.com/home/kmath196/kmath196.htm" target="_blank">Kevin Brown (Heron's triangle formula)</a></li> <li><a href="http://www.iihr.uiowa.edu/products/history/hoh/hero.html" target="_blank">University of Iowa</a></li> <li><a href="http://scihi.org/hero-alexandria/" target="_blank">Sci Hi blog</a></li> </ol> </div> </div> <hr /> <div class="row"> <div class="col-md-12"> <h3> Honours (<a href="#" id="honours-toggle">show</a>) </h3> </div> </div> <div class="row" id="honours-list"> <div class="col-md-12"> Honours awarded to Heron of Alexandria <ol name="honours"> <li><a href="../../Miscellaneous/Popular/">Popular biographies list Number 26</a></li> </ol> </div> </div> <hr /> <div class="row"> <div class="col-md-12"> <h3> Cross-references (<a href="#" id="xrefs-toggle">show</a>) </h3> </div> </div> <div class="row" id="xrefs-list"> <div class="col-md-12"> <ol name="xrefs"> <li><a href="../../HistTopics/Archimedes_num_an/">History Topics: Archimedes: Numerical Analyst</a></li> <li><a href="../../HistTopics/Doubling_the_cube/">History Topics: Doubling the cube</a></li> <li><a href="../../HistTopics/Euclid_definitions/">History Topics: Euclid's definitions</a></li> <li><a href="../../HistTopics/Greek_astronomy/">History Topics: Greek astronomy</a></li> <li><a href="../../HistTopics/Light_1/">History Topics: Light through the ages: Ancient Greece to Maxwell</a></li> <li><a href="../../HistTopics/Chinese_overview/">History Topics: Overview of Chinese mathematics</a></li> <li><a href="../../HistTopics/Babylonian_Pythagoras/">History Topics: Pythagoras's theorem in Babylonian mathematics</a></li> <li><a href="../../HistTopics/Golden_ratio/">History Topics: The Golden ratio</a></li> <li><a href="../../Miscellaneous/Popular_2009/">Other: 2009 Most popular biographies</a></li> <li><a href="../../Miller/mathword/c/">Other: Earliest Known Uses of Some of the Words of Mathematics (C)</a></li> <li><a href="../../Miller/mathword/d/">Other: Earliest Known Uses of Some of the Words of Mathematics (D)</a></li> <li><a href="../../Miller/mathword/h/">Other: Earliest Known Uses of Some of the Words of Mathematics (H)</a></li> <li><a href="../../Miller/mathsym/geometry/">Other: Earliest Uses of Symbols from Geometry</a></li> <li><a href="../../Miller/mathsym/operation/">Other: Earliest Uses of Symbols of Operation</a></li> <li><a href="../../Miller/stamps/">Other: Jeff Miller's postage stamps</a></li> <li><a href="../../Miscellaneous/Popular/">Other: Most popular biographies – 2024</a></li> <li><a href="../../Miscellaneous/Popular_2018/">Other: Popular biographies 2018</a></li> <li><a href="../../Miscellaneous/Sci_Hi_links/">Other: Sci Hi blog links</a></li> </ol> </div> </div> <hr /> <div class="row"> <div class="col-md-12"> 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