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File:  Content/TheoryOfSets/notsubset/recnotsubset1.xml (mml file)  
Author:  MathML 2 Recommendation  
Description:  A is not subset of B as <apply>  
Sample Rendering: 

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