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Liron comments on Second-Order Logic: The Controversy - Less Wrong
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When I learned about Lowenhein-Skolem, I just thought "lol first-order logic sux". I didn't question whether distinguishing among infinite cardinalities was a meaningful thing for humans to do. Eliezer is clearly a higher-order student of logic.
Er, to be clear about not taking credit, this is a long-running philosophical debate in mathematics. The parts about "Well, what physics, then?" I haven't read elsewhere but that could just be limited reading.
And what about Skolem's Paradox? Does it make you think "lol set theory sux"? :)