We already have the biconditionalized version of this at
https://us.metamath.org/mpeuni/elnnz1.html
There's a general rule here, which is written down in
https://us.metamath.org/mpeuni/conventions.html in the paragraph
starting "There are basically two ways to maximize the effectiveness of
biconditional"
On 4/18/23 19:40, LM wrote:
what is most set.mm-fitting way to prove:
( ( A e. ZZ /\ 1 <_ A ) -> A e. NN )
?
Grepping through set.mm I only find " e. NN " on antecedent side,
never on consequent side.
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