Aquinas was a pretty competent logician, even if he was rather encumbered by a love of Aristotle. It's not the mechanics of proof*; it's the initial axioms.
* well, alright, perhaps it is, rather. I've heard a few "you can't do X from first principles" which often turns out to be a declaration that the speaker has a fairly broken notion of what it is to "do X" (that neatly complements their wrong set of first principles) rather than a tautology.
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Re: Assumptions
Date: 2010-10-02 10:57 am (UTC)* well, alright, perhaps it is, rather. I've heard a few "you can't do X from first principles" which often turns out to be a declaration that the speaker has a fairly broken notion of what it is to "do X" (that neatly complements their wrong set of first principles) rather than a tautology.