reuse proofs from Deflation.thy; clean up proof of finite_range_cfun_lemma
reuse proofs from Deflation.thy; clean up proof of finite_range_cfun_lemma

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle