clarified vacuous nature of predicate "transfer_morphism" -- equivalent to previous definiton
clarified vacuous nature of predicate "transfer_morphism" -- equivalent to previous definiton

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