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</div> </div> <div id="body"> <div id="main"> <div class="messages"> </div> <div id="classification"> <div class="content-main"> <div class="content-result"> <div class="head"> <h2>Mathematics Subject Classification – MSC2020</h2> </div> <div class="item level0"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57">57-XX</a></div> <div class="text"> <a href="/classification/?q=cc%3A57">Manifolds and cell complexes</a> {For complex manifolds, see <a href="/classification/?q=cc%3A32Q%2A">32Qxx</a>} <a target="_blank" href="/atom/cc/57"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57"><i class="glyphicon glyphicon-share-alt"></i> 67284</a> </div> </article> </div> <div class="item level1"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N">57Nxx</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N">Topological manifolds</a> <a target="_blank" href="/atom/cc/57N"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N"><i class="glyphicon glyphicon-share-alt"></i> 12451</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N16">57N16</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N16">Geometric structures on manifolds of high or arbitrary dimension</a> [See also <a href="/classification/?q=cc%3A57M50">57M50</a>] <a target="_blank" href="/atom/cc/57N16"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N16" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N16"><i class="glyphicon glyphicon-share-alt"></i> 372</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N17">57N17</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N17">Topology of topological vector spaces</a> <a target="_blank" href="/atom/cc/57N17"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N17" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N17"><i class="glyphicon glyphicon-share-alt"></i> 179</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N20">57N20</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N20">Topology of infinite-dimensional manifolds</a> [See also <a href="/classification/?q=cc%3A58B%2A">58Bxx</a>] <a target="_blank" href="/atom/cc/57N20"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N20" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N20"><i class="glyphicon glyphicon-share-alt"></i> 728</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N25">57N25</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N25">Shapes (aspects of topological manifolds)</a> [See also <a href="/classification/?q=cc%3A54C56">54C56</a>, <a href="/classification/?q=cc%3A55P55">55P55</a>, <a href="/classification/?q=cc%3A55Q07">55Q07</a>] <a target="_blank" href="/atom/cc/57N25"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N25" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N25"><i class="glyphicon glyphicon-share-alt"></i> 241</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N30">57N30</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N30">Engulfing in topological manifolds</a> <a target="_blank" href="/atom/cc/57N30"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N30" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N30"><i class="glyphicon glyphicon-share-alt"></i> 48</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N35">57N35</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N35">Embeddings and immersions in topological manifolds</a> <a target="_blank" href="/atom/cc/57N35"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N35" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N35"><i class="glyphicon glyphicon-share-alt"></i> 895</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N37">57N37</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N37">Isotopy and pseudo-isotopy</a> <a target="_blank" href="/atom/cc/57N37"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N37" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N37"><i class="glyphicon glyphicon-share-alt"></i> 158</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N40">57N40</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N40">Neighborhoods of submanifolds</a> <a target="_blank" href="/atom/cc/57N40"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N40" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N40"><i class="glyphicon glyphicon-share-alt"></i> 123</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N45">57N45</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N45">Flatness and tameness of topological manifolds</a> <a target="_blank" href="/atom/cc/57N45"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N45" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N45"><i class="glyphicon glyphicon-share-alt"></i> 266</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N50">57N50</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N50">\(S^{n-1}\subset E^n\), Schoenflies problem</a> <a target="_blank" href="/atom/cc/57N50"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N50" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N50"><i class="glyphicon glyphicon-share-alt"></i> 117</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N55">57N55</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N55">Microbundles and block bundles</a> [See also <a href="/classification/?q=cc%3A55R60">55R60</a>, <a href="/classification/?q=cc%3A57Q50">57Q50</a>] <a target="_blank" href="/atom/cc/57N55"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N55" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N55"><i class="glyphicon glyphicon-share-alt"></i> 79</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N60">57N60</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N60">Cellularity in topological manifolds</a> <a target="_blank" href="/atom/cc/57N60"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N60" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N60"><i class="glyphicon glyphicon-share-alt"></i> 296</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N65">57N65</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N65">Algebraic topology of manifolds</a> <a target="_blank" href="/atom/cc/57N65"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N65" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N65"><i class="glyphicon glyphicon-share-alt"></i> 1080</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N70">57N70</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N70">Cobordism and concordance in topological manifolds</a> <a target="_blank" href="/atom/cc/57N70"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N70" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N70"><i class="glyphicon glyphicon-share-alt"></i> 329</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N75">57N75</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N75">General position and transversality</a> <a target="_blank" href="/atom/cc/57N75"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N75" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N75"><i class="glyphicon glyphicon-share-alt"></i> 126</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N80">57N80</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N80">Stratifications in topological manifolds</a> <a target="_blank" href="/atom/cc/57N80"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N80" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N80"><i class="glyphicon glyphicon-share-alt"></i> 411</a> </div> </article> </div> <div class="item level2"> <article> <div class="code"><a class="mono" href="/classification/?q=cc%3A57N99">57N99</a></div> <div class="text"> <a href="/classification/?q=cc%3A57N99">None of the above, but in this section</a> <a target="_blank" href="/atom/cc/57N99"><img class="feed-icon" alt="Recent zbMATH articles in MSC 57N99" src="/static/feed-icon-12x12.png"></a> <a class="zbmath" title="Documents in zbMATH" href="/?q=cc%3A57N99"><i class="glyphicon glyphicon-share-alt"></i> 364</a> </div> </article> </div> </div> <div class="content-filter"> <div > <div class="overview"> <h4>Overview</h4> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A00">00</a> </div> <div class="half"> <a href="/classification/?q=cc%3A00">General and overarching topics; collections</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A01">01</a> </div> <div class="half"> <a href="/classification/?q=cc%3A01">History and biography</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A03">03</a> </div> <div class="half"> <a href="/classification/?q=cc%3A03">Mathematical logic and foundations</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A05">05</a> </div> <div class="half"> <a href="/classification/?q=cc%3A05">Combinatorics</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A06">06</a> </div> <div class="half"> <a href="/classification/?q=cc%3A06">Order, lattices, ordered algebraic structures</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A08">08</a> </div> <div class="half"> <a href="/classification/?q=cc%3A08">General algebraic systems</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A11">11</a> </div> <div class="half"> <a href="/classification/?q=cc%3A11">Number theory</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A12">12</a> </div> <div class="half"> <a href="/classification/?q=cc%3A12">Field theory and polynomials</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A13">13</a> </div> <div class="half"> <a href="/classification/?q=cc%3A13">Commutative algebra</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A14">14</a> </div> <div class="half"> <a href="/classification/?q=cc%3A14">Algebraic geometry</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A15">15</a> </div> <div class="half"> <a href="/classification/?q=cc%3A15">Linear and multilinear algebra; matrix theory</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A16">16</a> </div> <div class="half"> <a href="/classification/?q=cc%3A16">Associative rings and algebras</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A17">17</a> </div> <div class="half"> <a href="/classification/?q=cc%3A17">Nonassociative rings and algebras</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A18">18</a> </div> <div class="half"> <a href="/classification/?q=cc%3A18">Category theory; homological algebra</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A19">19</a> </div> <div class="half"> <a href="/classification/?q=cc%3A19">\(K\)-theory</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A20">20</a> </div> <div class="half"> <a href="/classification/?q=cc%3A20">Group theory and generalizations</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A22">22</a> </div> <div class="half"> <a href="/classification/?q=cc%3A22">Topological groups, Lie groups</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A26">26</a> </div> <div class="half"> <a href="/classification/?q=cc%3A26">Real functions</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A28">28</a> </div> <div class="half"> <a href="/classification/?q=cc%3A28">Measure and integration</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A30">30</a> </div> <div class="half"> <a href="/classification/?q=cc%3A30">Functions of a complex variable</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A31">31</a> </div> <div class="half"> <a href="/classification/?q=cc%3A31">Potential theory</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A32">32</a> </div> <div class="half"> <a href="/classification/?q=cc%3A32">Several complex variables and analytic spaces</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A33">33</a> </div> <div class="half"> <a href="/classification/?q=cc%3A33">Special functions</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A34">34</a> </div> <div class="half"> <a href="/classification/?q=cc%3A34">Ordinary differential equations</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A35">35</a> </div> <div class="half"> <a href="/classification/?q=cc%3A35">Partial differential equations</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A37">37</a> </div> <div class="half"> <a href="/classification/?q=cc%3A37">Dynamical systems and ergodic theory</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A39">39</a> </div> <div class="half"> <a href="/classification/?q=cc%3A39">Difference and functional equations</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A40">40</a> </div> <div class="half"> <a href="/classification/?q=cc%3A40">Sequences, series, summability</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A41">41</a> </div> <div class="half"> <a href="/classification/?q=cc%3A41">Approximations and expansions</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A42">42</a> </div> <div class="half"> <a href="/classification/?q=cc%3A42">Harmonic analysis on Euclidean spaces</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A43">43</a> </div> <div class="half"> <a href="/classification/?q=cc%3A43">Abstract harmonic analysis</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A44">44</a> </div> <div class="half"> <a href="/classification/?q=cc%3A44">Integral transforms, operational calculus</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A45">45</a> </div> <div class="half"> <a href="/classification/?q=cc%3A45">Integral equations</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A46">46</a> </div> <div class="half"> <a href="/classification/?q=cc%3A46">Functional analysis</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A47">47</a> </div> <div class="half"> <a href="/classification/?q=cc%3A47">Operator theory</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A49">49</a> </div> <div class="half"> <a href="/classification/?q=cc%3A49">Calculus of variations and optimal control; optimization</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A51">51</a> </div> <div class="half"> <a href="/classification/?q=cc%3A51">Geometry</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A52">52</a> </div> <div class="half"> <a href="/classification/?q=cc%3A52">Convex and discrete geometry</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A53">53</a> </div> <div class="half"> <a href="/classification/?q=cc%3A53">Differential geometry</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A54">54</a> </div> <div class="half"> <a href="/classification/?q=cc%3A54">General topology</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A55">55</a> </div> <div class="half"> <a href="/classification/?q=cc%3A55">Algebraic topology</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A57">57</a> </div> <div class="half"> <a href="/classification/?q=cc%3A57">Manifolds and cell complexes</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A58">58</a> </div> <div class="half"> <a href="/classification/?q=cc%3A58">Global analysis, analysis on manifolds</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A60">60</a> </div> <div class="half"> <a href="/classification/?q=cc%3A60">Probability theory and stochastic processes</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A62">62</a> </div> <div class="half"> <a href="/classification/?q=cc%3A62">Statistics</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A65">65</a> </div> <div class="half"> <a href="/classification/?q=cc%3A65">Numerical analysis</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A68">68</a> </div> <div class="half"> <a href="/classification/?q=cc%3A68">Computer science</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A70">70</a> </div> <div class="half"> <a href="/classification/?q=cc%3A70">Mechanics of particles and systems</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A74">74</a> </div> <div class="half"> <a href="/classification/?q=cc%3A74">Mechanics of deformable solids</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A76">76</a> </div> <div class="half"> <a href="/classification/?q=cc%3A76">Fluid mechanics</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A78">78</a> </div> <div class="half"> <a href="/classification/?q=cc%3A78">Optics, electromagnetic theory</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A80">80</a> </div> <div class="half"> <a href="/classification/?q=cc%3A80">Classical thermodynamics, heat transfer</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A81">81</a> </div> <div class="half"> <a href="/classification/?q=cc%3A81">Quantum theory</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A82">82</a> </div> <div class="half"> <a href="/classification/?q=cc%3A82">Statistical mechanics, structure of matter</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A83">83</a> </div> <div class="half"> <a href="/classification/?q=cc%3A83">Relativity and gravitational theory</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A85">85</a> </div> <div class="half"> <a href="/classification/?q=cc%3A85">Astronomy and astrophysics</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A86">86</a> </div> <div class="half"> <a href="/classification/?q=cc%3A86">Geophysics</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A90">90</a> </div> <div class="half"> <a href="/classification/?q=cc%3A90">Operations research, mathematical programming</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A91">91</a> </div> <div class="half"> <a href="/classification/?q=cc%3A91">Game theory, economics, finance, and other social and behavioral sciences</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A92">92</a> </div> <div class="half"> <a href="/classification/?q=cc%3A92">Biology and other natural sciences</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A93">93</a> </div> <div class="half"> <a href="/classification/?q=cc%3A93">Systems theory; control</a> </div> </article> </div> <div class="item"> <article> <div class="code"> <a class="mono" href="/classification/?q=cc%3A94">94</a> </div> <div class="half"> <a href="/classification/?q=cc%3A94">Information and communication theory, circuits</a> </div> </article> </div> <div 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