# [Tex/LaTex] the not subset symbol

math-modesymbols

Possible Duplicate:
How to look up a math symbol?

I am looking for the "not subset" symbol I see in my maths textbook. Wheres that?

In Lyx, I dont see it … Same here under relations

As always, Detexify is a great help here, or even the Comprehensive LaTeX Symbol List. You are looking for \not\subset:
B \not\subset A