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Re: Extensional modals?

Feel free to ask questions when in doubt.

Note that the first syllogism you quote, viz. 1. S is M, M are always-P, therefore S is always-P, has a lesser valid conclusion, viz. S is P (without the always).

Whereas the second one, viz. 2. S is M, M are sometimes-P, therefore S is sometimes-P, does not have any valid conclusion.