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add ndr_void_proofs_irrelevant
author
Adam Megacz
<megacz@cs.berkeley.edu>
Fri, 25 Mar 2011 18:09:55 +0000
(11:09 -0700)
committer
Adam Megacz
<megacz@cs.berkeley.edu>
Fri, 25 Mar 2011 18:09:55 +0000
(11:09 -0700)
src/NaturalDeduction.v
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a/src/NaturalDeduction.v
b/src/NaturalDeduction.v
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cd225da
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--- a/
src/NaturalDeduction.v
+++ b/
src/NaturalDeduction.v
@@
-212,6
+212,9
@@
Section Natural_Deduction.
(* any two _structural_ proofs with the same hypotheses/conclusions must be considered equal *)
; ndr_structural_indistinguishable : forall `(f:a/⋯⋯/b)(g:a/⋯⋯/b), Structural f -> Structural g -> f===g
+
+ (* any two proofs of nothing are "equally good" *)
+ ; ndr_void_proofs_irrelevant : forall `(f:a/⋯⋯/[])(g:a/⋯⋯/[]), f === g
}.
(*