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David Swasey
coq-stdpp
Commits
9d1092a0
Commit
9d1092a0
authored
Sep 24, 2017
by
Robbert Krebbers
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Unfolding lemma for Acc.
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theories/relations.v
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9d1092a0
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@@ -198,6 +198,9 @@ Notation wf := well_founded.
Section
wf
.
Context
`
{
R
:
relation
A
}.
Lemma
Acc_def
x
:
Acc
R
x
↔
(
∀
y
:
A
,
R
y
x
→
Acc
R
y
).
Proof
.
split
.
by
destruct
1
.
by
constructor
.
Qed
.
(** A trick by Thomas Braibant to compute with well-founded recursions:
it lazily adds [2^n] [Acc_intro] constructors in front of a well foundedness
proof, so that the actual proof is never reached in practise. *)
...
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