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- From: Andrej Bauer <andrej.bauer AT andrej.com>
- To: Coq Club <coq-club AT inria.fr>
- Subject: [Coq-Club] Does Coq actively convert things to Prop?
- Date: Wed, 18 Apr 2012 10:07:22 +0200
Consider the following example:
Parameter A : Type.
Definition cow (P : forall (x : A), A -> Type) := forall x y : A, P x y.
Inductive Q (x : A) : A -> Type := horn : Q x x.
Definition q := cow Q.
Definition r := forall x y : A, Q x y.
r is just q expanded out by hand, but q is in Type and r is in Prop.
This seems awfully wrong. Can someone convince me that it is not a
bug? It destroys homotopy type theory in Coq, where we want to keep
things in Type.
With kind regards,
Andrej
- [Coq-Club] Does Coq actively convert things to Prop?, Andrej Bauer
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Frederic Blanqui
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Arnaud Spiwack
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Andrej Bauer
- Re: [Coq-Club] Does Coq actively convert things to Prop?, Andrej Bauer
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Arnaud Spiwack
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Andrej Bauer
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Bernard Hurley
- Re: [Coq-Club] Does Coq actively convert things to Prop?, Andrej Bauer
- Re: [Coq-Club] Does Coq actively convert things to Prop?, AUGER Cédric
- Re: [Coq-Club] Does Coq actively convert things to Prop?, Frederic Blanqui
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Bernard Hurley
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Andrej Bauer
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Andrej Bauer
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Arnaud Spiwack
- Re: [Coq-Club] Does Coq actively convert things to Prop?,
Frederic Blanqui
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