Without an independent criterion for ship-continuity that doesn't already encode the conclusion, Carter's identification of O with the original ship is question-begging by Chisholm's own standards of circular reasoning.

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Circular reasoning(the trap that occurs when trying to define counterfactuals): A logical mistake where you use the very thing you're trying to prove as part of your argument, like saying 'I'm trustworthy because I said I am'—this goes in circles and doesn't actually explain anything.
Independent criterion(as used in logic and evaluation): A separate, objective standard or test for judging something that doesn't depend on the thing being judged itself.
Roderick Chisholm(as referenced by name in the statement): A 20th-century American philosopher known for developing detailed theories about knowledge, justified belief, and how much evidence we need to believe something.
Ship-continuity(refers to a famous thought experiment about identity and change): The philosophical puzzle of what makes a ship the same ship over time, especially if its parts are replaced one by one. For example, if every plank of a wooden ship is gradually replaced, is it still the same ship?

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