I'm have trouble with this, and I can't find an example in the set.mm. How would you prove something like zeroimpxpxeqzero $p |- ( x = 0 -> x + x = 0 ) ? (or x = 1 -> x + x = 2, etc.) I've got a similar problem in group theory that would be trivial if I could find something to move the equality across the implication and convert it into 0 + 0 = 0.
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