# How to type logical expressions in WolframAlpha?

Usually WolframAlpha understands what logical expression I have entered but sometimes I can't find a way to do it especially when you are using equivalent sign.

For example if I have $$p \land q \Leftrightarrow \lnot q$$ I type (p AND q) equivalent (NOT q) and it doesn't work, I have tried other various methods it didn't work either.

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This is very strange, perhaps a bug, since "a equivalent b" is interpreted correctly. –  magma Jan 24 '12 at 20:01
Use XNOR instead of equivalent.