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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> <head> <title>Home | Open Problem Garden</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <style type="text/css" media="all">@import "/misc/drupal.css";</style><link rel="alternate" type="application/rss+xml" title="All comments" href="http://garden.irmacs.sfu.ca/crss" /> <link rel="alternate" type="application/rss+xml" title="Comments for Home" href="http://garden.irmacs.sfu.ca/crss/node/62" /> <link rel="alternate" type="application/rss+xml" title="Comments for all *page* posts" href="http://garden.irmacs.sfu.ca/crss/nodetype/page" /> <style type="text/css">@import url(/modules/drutex/drutex.css);</style> <meta name="keywords" content="collection of open problems,mathematics," /> <link rel="shortcut icon" href="/files/dodec.png" type="image/x-icon" /> <style type="text/css" media="all">@import "/modules/administration/administration.css";</style><style type="text/css" media="all">@import "/modules/cck/content.css";</style><style type="text/css" media="all">@import "/themes/bluebreeze/style.css";</style> <script type="text/javascript"> </script> </head> <body id="home"> <div id="page" class="one-sidebar"> <div id="header"> <div id="logo-title"> <a href="/" title="Home"> <img src="/files/dodec.png" alt="Home" id="logo" /> </a> <h1 id='site-name'> <a href="/" title="Home"> Open Problem Garden </a> </h1> </div> <div class="menu withprimary "> <div id="primary" class="clear-block"> <ul class="links-menu"> <li><a href="/help" title="">Help</a></li> <li><a href="/about" title="">About</a></li> <li><a href="/contact" title="email us">Contact</a></li> </ul> </div> </div> <div id="header-region"> <div class="block block-block" id="block-block-2"> <div class="blockinner"> <div class="content"> <img src="/files/happy5.png" vspace=5> <a href="?q=login-create">login/create account</a> </div> </div> </div> </div> </div> <div id="container" class="withleft clear-block"> <div id="main-wrapper"> <div id="main" class="clear-block"> <h1 class="title"> Home </h1> <!-- begin content --><div class="node" id="node-62"> <p><b>Welcome to the Open Problem Garden</b>, a collection of unsolved problems in mathematics. Here you may: <ul style="margin: 0 0 0 0;"> <li>Read descriptions of open problems. </li> <li>Post comments on them. </li> <li>Create and edit open problems pages (please contact us and we will set you up an account. Unfortunately, the automatic process is too prone to spammers at this moment.) </li> </ul> </p> <p><br> <b>Help us Grow! </b> <br> We are eager to expand, so we are inviting contributions both large and small from all areas of mathematics. <br> Many thanks to <a href='?q=userlist/content/content_op'>our contributors</a>! </p> <p><br> <b>More about the Garden</b> <ul> <li><a href="?q=structure">Structure</a></li> <li><a href="?q=purpose">Purpose</a></li> <li><a href="?q=editorial_policy">Editorial Policy</a></li> <li><a href="?q=help/rss_feeds">RSS feeds</a> (get what you want delivered to you!)</li> </ul> </p> <br><br><br><br><br><br> <a href="?q=container/area/feed"><img src="misc/feed.png"/></a> <div class="links"> </div> </div> <!-- end content --> </div> </div> <div id="sidebar-left" class="sidebar"> <div id="search" class="container-inline"> <form action="/search" method="post" id="search_theme_form"> <div><div class="form-item"> <input type="text" maxlength="128" name="edit[search_theme_form_keys]" id="edit-search_theme_form_keys" size="15" value="" title="Enter the terms you wish to search for." class="form-text" /> </div> <input type="submit" name="op" value="Search" class="form-submit" /> <input type="hidden" name="edit[form_id]" id="edit-search-theme-form" value="search_theme_form" /> </div></form> </div> <div class="block block-menu" id="block-menu-195"> <div class="blockinner"> <h2 class="title"> Navigate </h2> <div class="content"> <ul class="menu"> <li class="expanded"><a href="/container/area" title="">Subject</a> <ul class="menu"> <li class="leaf"><a href="/category/algebra" title="">Algebra</a> (295)</LI> <li class="leaf"><a href="/category/analysis" title="">Analysis</a> (5)</LI> <li class="collapsed"><a href="/category/combinatorics" title="">Combinatorics</a> (35)</LI> <li class="collapsed"><a href="/category/geometry" title="">Geometry</a> (29)</LI> <li class="collapsed"><a href="/category/graph_theory" title="">Graph Theory</a> (228)</LI> <li class="leaf"><a href="/category/group_theory" title="">Group Theory</a> (5)</LI> <li class="collapsed"><a href="/category/logic" title="">Logic</a> (10)</LI> <li class="collapsed"><a href="/category/number_theory_0" title="">Number Theory</a> (49)</LI> <li class="leaf"><a href="/category/pdes" title="">PDEs</a> (0)</LI> <li class="leaf"><a href="/category/probability" title="">Probability</a> (1)</LI> <li class="collapsed"><a href="/category/theoretical_computer_science" title="">Theoretical Comp. Sci.</a> (13)</LI> <li class="leaf"><a href="/topology" title="">Topology</a> (40)</LI> <li class="leaf"><a href="/category/unsorted" title="">Unsorted</a> (1)</LI> </ul> </LI> <li class="leaf"><a href="/author" title="">Author index</a></LI> <li class="leaf"><a href="/keywords" title="">Keyword index</a></LI> <div class='more-link'><a href="/other_pages">more</a></div> </ul> </div> </div> </div> <div class="block block-views" id="block-views-recent_activity"> <div class="blockinner"> <h2 class="title"> Recent Activity </h2> <div class="content"> <div class='view view-recent-activity'><div class='teststyle'><div class='view-content view-content-recent-activity'><div class="item-list"><ul><li><div class='view-item view-item-recent-activity'><div class='view-field view-data-node-title'><a href="/op/nowhere_zero_flows">Nowhere-zero flows</a></div></div> </li><li><div class='view-item view-item-recent-activity'><div class='view-field view-data-node-title'><a href="/op/shuffle_exchange_conjecture_0">Shuffle-Exchange Conjecture</a></div></div> </li><li><div class='view-item view-item-recent-activity'><div class='view-field view-data-node-title'><a href="/op/algebra">Algebra</a></div></div> </li><li><div class='view-item view-item-recent-activity'><div class='view-field view-data-node-title'><a href="/op/seagull_problem_0">Seagull problem</a></div></div> </li><li><div class='view-item view-item-recent-activity'><div class='view-field view-data-node-title'><a href="/op/solution_to_the_lonely_runner_conjecture_0">Solution to the Lonely Runner Conjecture</a></div></div> </li></ul></div></div><div class='more-link'><a href="/recent_activity">more</a></div></div></div> </div> </div> </div> </div> </div> <div id="footer"> Powered by <a href="http://www.drupal.org"> <img src="/files/drup7.png" vspace="0" /> Drupal</a> Hosted by <a href="http://iuuk.mff.cuni.cz"> <img src="/files/iuuk-logo-t.png" /> CSI of Charles University</a> Content distributed under <a href="http://www.gnu.org/copyleft/fdl.html"><img src="/files/gnu-fdl3.png"></a> <a href="?q=disclaimer">Disclaimer</a> </div> </div> </body> </html>