package coq

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Formal proof management system

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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-8.15.0.tar.gz
sha256=73466e61f229b23b4daffdd964be72bd7a110963b9d84bd4a86bb05c5dc19ef3

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