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String-net liquid
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<p>In <a href="/facts/Condensed_matter_physics/EBVI5nmL">condensed matter physics</a>, a string-net is an extended object whose collective behavior has been proposed as a physical mechanism for <a href="/facts/Topological_order/EfEnKRSw">topological order</a> by Michael A. Levin and <a href="/facts/Xiao-Gang_Wen/IHB58kKP">Xiao-Gang Wen</a>. A particular string-net model may involve only closed loops; or networks of oriented, labeled strings obeying branching rules given by some <a href="/facts/Gauge_group/fSW3gggv">gauge group</a>; or still more general networks. </p>