diff options
Diffstat (limited to 'engine/univMinim.mli')
| -rw-r--r-- | engine/univMinim.mli | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/engine/univMinim.mli b/engine/univMinim.mli new file mode 100644 index 00000000..9f80b7ac --- /dev/null +++ b/engine/univMinim.mli @@ -0,0 +1,32 @@ +(************************************************************************) +(* * The Coq Proof Assistant / The Coq Development Team *) +(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *) +(* <O___,, * (see CREDITS file for the list of authors) *) +(* \VV/ **************************************************************) +(* // * This file is distributed under the terms of the *) +(* * GNU Lesser General Public License Version 2.1 *) +(* * (see LICENSE file for the text of the license) *) +(************************************************************************) + +open Univ +open UnivSubst + +(** Unordered pairs of universe levels (ie (u,v) = (v,u)) *) +module UPairSet : CSet.S with type elt = (Level.t * Level.t) + +(** Simplification and pruning of constraints: + [normalize_context_set ctx us] + + - Instantiate the variables in [us] with their most precise + universe levels respecting the constraints. + + - Normalizes the context [ctx] w.r.t. equality constraints, + choosing a canonical universe in each equivalence class + (a global one if there is one) and transitively saturate + the constraints w.r.t to the equalities. *) + +val normalize_context_set : UGraph.t -> ContextSet.t -> + universe_opt_subst (* The defined and undefined variables *) -> + LSet.t (* univ variables that can be substituted by algebraics *) -> + UPairSet.t (* weak equality constraints *) -> + (universe_opt_subst * LSet.t) in_universe_context_set |