QCRs vs functional property

Question

I have question based on the topic:

SOF - Einstein puzzle in OWL

In the owl, all cardinality restrictions are based on functional and inverse functional pro

Answer 1

I believe the two versions are not exactly equivalent. If drinks is inverse functional, two men drinking the same instance of drink are inferred to be the same man. In the second version, that's not the case (from your description, I have not checked the ontologies yet).

Edit: discussed this with Dmitry Tsarkov (main developer for FaCT++). He remarked that a functional characteristic is equivalent to max 1 cardinality. exactly 1 cardinality includes existence, meaning the reasoner has a different tableaux to explore, which would be more complex. I've pointed him to this question to provide a more comprehensive answer.