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add pred_infinite_surj

Ralf Jung requested to merge ralf/pred_infinite_surj into master

I wondered when pred_infinite (P ∘ f) holds. This is the best lemma I could come up with so far. It's not the lemma I hoped for, but I realized the lemma I hoped for is wrong.^^ However, now that I did this proof, I figured it'd be a waste to throw it away.

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