Abstract
A recurring proof obligation in modern mathematics, ranging from textbook exercises to deep research problems, is to show that a given function is a morphism in some category: in analysis and topology, for example, we frequently need to prove that functions are continuous, while in group theory we are constantly concerned with homomorphisms. This paper describes a generic procedure that automatically discharges routine instances of this kind of proof obligation in an interactive theorem prover. The proof procedure has been implemented and found very useful in a mathematical case studies carried out using the ProofPower system
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