source: src/utilities/sigma.ma @ 1260

Last change on this file since 1260 was 1260, checked in by mulligan, 9 years ago

commit for csc

File size: 244 bytes
Line 
1include "basics/types.ma".
2
3(* Stuff about Sigma types *)
4definition pi1: ∀A.∀P:A → Prop. (Σx:A. P x) → A ≝
5 λA,P,c. match c with [ dp w _ ⇒ w ].
6coercion pi1: ∀A.∀P:A → Prop.∀p:(Σx:A. P x).A ≝ pi1 on _p:Σx:?.? to ?.
7
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