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How to write A is not a subset of B in LaTeX? I can write $A\nsubseteq B$, but I want to remove the equality sign. Please help.

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You want to say A is properly contained in B right? Then "\subset" should work. – S.C. Oct 13 '13 at 9:45
@Chandrasekhar Probably you can undelete your answer but I think the OP wanted something like $A \not\subset B$. – karlkoeller Oct 13 '13 at 9:48
Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. – karlkoeller Oct 13 '13 at 9:50
@karlkoeller: Answer undeleted – S.C. Oct 13 '13 at 9:55

As @karlkoeller mentions in a comment, $A \not\subset B$ should do the job.

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