I'm trying to use this answer's "not imply" symbol. However I get the error:

Argument of \mathpalette has an extra }

Here is a MWE:




$x\notimplies y$

The problem seems to be with the breqn package.


You betcha! breqn redefines \not to have an argument and so it finds \phantom, which is wrong in this context.

Add a couple of braces; even without breqn the result will be the same.


I removed the additional one around the \ooalign that serve no purpose, because \mathrel{...} forms a group.

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