Dependent Types and Parametric Polymorphic Types

I just ran across these notes Turing made in response to some communication from Max Newman: 




See Ian Grant's Weather Report agosto 08, 2022 in particular the second part:

And there's some text to explain it: see https://prooftoys.org/ian-grant/hm/ in particular, page 7 of the tutorial:

See Archive Centre King's College.

I was triggered by thinking about the dependent Types in Idris: see Marco Perone - Fun With Categories.

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