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File:  Content/TheoryOfSets/subset/recsubset1.xml (mml file)  
Author:  MathML 2 Recommendation  
Description:  A is subset of B as <apply>  
Sample Rendering: 

Your browser's rendering:
$A\subseteq B$
Source Code:
<math> <apply> <subset/> <ci> A </ci> <ci> B </ci> </apply> </math>