Start / Iowa Type Theory Commute / Natural deduction or the bad news

Iowa Type Theory Commute

Natural deduction: or, the bad news!

12 min • 14 september 2021

We discuss the problem of the or-elimination rule in natural deduction, which does not have the correct form for natural deduction inferences.  It is a research problem to fix this!

Don't forget to get in touch with me if you want to do the mini-course over Zoom next month, on normalization.  

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En liten tjänst av I'm With Friends. Finns även på engelska.

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