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Diffstat (limited to 'theories/Logic/ClassicalChoice.v')
| -rw-r--r-- | theories/Logic/ClassicalChoice.v | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/theories/Logic/ClassicalChoice.v b/theories/Logic/ClassicalChoice.v index bb8186ae..f9b59a6a 100644 --- a/theories/Logic/ClassicalChoice.v +++ b/theories/Logic/ClassicalChoice.v @@ -6,11 +6,17 @@ (* * GNU Lesser General Public License Version 2.1 *) (************************************************************************) -(*i $Id: ClassicalChoice.v 8892 2006-06-04 17:59:53Z herbelin $ i*) +(*i $Id: ClassicalChoice.v 10170 2007-10-03 14:41:25Z herbelin $ i*) -(** This file provides classical logic, and functional choice *) +(** This file provides classical logic and functional choice; this + especially provides both indefinite descriptions and choice functions + but this is weaker than providing epsilon operator and classical logic + as the indefinite descriptions provided by the axiom of choice can + be used only in a propositional context (especially, they cannot + be used to build choice functions outside the scope of a theorem + proof) *) -(** This file extends ClassicalUniqueChoice.v with the axiom of choice. +(** This file extends ClassicalUniqueChoice.v with full choice. As ClassicalUniqueChoice.v, it implies the double-negation of excluded-middle in [Set] and leads to a classical world populated with non computable functions. Especially it conflicts with the |