package coq

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Formal proof management system

Install 

dune-project
 Dependency

coq.inria.fr Edit opam file Versions (40)

Authors

  1. T
    The Coq development team, INRIA, CNRS, and contributors.

Maintainers

  1. C
    coqdev@inria.fr

Sources

coq-8.16.0.tar.gz
sha256=36577b55f4a4b1c64682c387de7abea932d0fd42fc0cd5406927dca344f53587

doc/coq-core.kernel/Univ/Variance/index.html

Module Univ.VarianceSource

Sourcetype t =
  1. | Irrelevant
  2. | Covariant
  3. | Invariant

A universe position in the instance given to a cumulative inductive can be the following. Note there is no Contravariant case because forall x : A, B <= forall x : A', B' requires A = A' as opposed to A' <= A.

Sourceval check_subtype : t -> t -> bool

check_subtype x y holds if variance y is also an instance of x

Sourceval sup : t -> t -> t
Sourceval pr : t -> Pp.t
Sourceval equal : t -> t -> bool