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The proof-theoretic ordinal of a logical theory

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Manage episode 307643229 series 2823367
Content provided by Aaron Stump. All podcast content including episodes, graphics, and podcast descriptions are uploaded and provided directly by Aaron Stump or their podcast platform partner. If you believe someone is using your copyrighted work without your permission, you can follow the process outlined here https://player.fm/legal.

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.)

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166 episodes

Artwork
iconShare
 
Manage episode 307643229 series 2823367
Content provided by Aaron Stump. All podcast content including episodes, graphics, and podcast descriptions are uploaded and provided directly by Aaron Stump or their podcast platform partner. If you believe someone is using your copyrighted work without your permission, you can follow the process outlined here https://player.fm/legal.

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.)

  continue reading

166 episodes

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