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The proof-theoretic ordinal of a logical theory
Manage episode 307643229 series 2823367
Ordinal analysis seeks to determine the strength of a logical theory by assigning an ordinal to it. Which one? In this episode I describe a definition of the proof-theoretic ordinal of a logical theory from a paper by proof theorist Michael Rathjen. It is basically a measure of how strong an induction principle is derivable in the theory. (The first parts of the paper are pretty accessible, but the rest gets hard, at least for me.)
161 つのエピソード
Manage episode 307643229 series 2823367
Ordinal analysis seeks to determine the strength of a logical theory by assigning an ordinal to it. Which one? In this episode I describe a definition of the proof-theoretic ordinal of a logical theory from a paper by proof theorist Michael Rathjen. It is basically a measure of how strong an induction principle is derivable in the theory. (The first parts of the paper are pretty accessible, but the rest gets hard, at least for me.)
161 つのエピソード
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