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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
up vote 3 down vote accepted

Use XNOR instead of equivalent.

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yeah it's same and it works, thanks! – Templar Jan 23 '12 at 12:58

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