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research
cpdt
Commits
f5e58b2e
Commit
f5e58b2e
authored
Sep 28, 2008
by
Adam Chlipala
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Predicates.v
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src/Predicates.v
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f5e58b2e
...
@@ -670,7 +670,7 @@ Abort.
...
@@ -670,7 +670,7 @@ Abort.
Lemma
even_contra
'
:
forall
n
'
,
even
n
'
->
forall
n
,
n
'
=
S
(
n
+
n
)
->
False
.
Lemma
even_contra
'
:
forall
n
'
,
even
n
'
->
forall
n
,
n
'
=
S
(
n
+
n
)
->
False
.
induction
1
;
crush
.
induction
1
;
crush
.
(
**
At
this
point
,
it
is
useful
to
consider
all
cases
of
[
n
]
and
[
n0
]
being
zero
or
nonzero
.
Only
one
of
these
cases
has
any
trick
y
ness
to
it
.
*
)
(
**
At
this
point
,
it
is
useful
to
consider
all
cases
of
[
n
]
and
[
n0
]
being
zero
or
nonzero
.
Only
one
of
these
cases
has
any
trick
i
ness
to
it
.
*
)
destruct
n
;
destruct
n0
;
crush
.
destruct
n
;
destruct
n0
;
crush
.
(
**
[[
(
**
[[
...
...
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