amssymb is a LaTeX package to provide access to the extra mathematics symbols of the fonts from the AMS (American Mathematical Society)

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Negation of nleftrightarrow?

If I use $\nleftrightarrow$ from the amssymb package, I get a negated double-headed arrow. So far, so good. Unfortunately, the $\nleftrightarrow$ seems to have smaller arrow heads then the ...