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cpdt
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0b9d5d4f
Commit
0b9d5d4f
authored
Sep 26, 2013
by
Adam Chlipala
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Fix a word that was only included in LaTeX version
parent
5ecfe806
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GeneralRec.v
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src/GeneralRec.v
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0b9d5d4f
...
...
@@ -169,7 +169,7 @@ Before writing [mergeSort], we need to settle on a well-founded relation. The r
red
;
intro
;
eapply
lengthOrder_wf
'
;
eauto
.
Defined
.
(
**
Notice
that
we
end
these
proofs
with
%
\
index
{
Vernacular
commands
!
Defined
}%
[
Defined
]
,
not
[
Qed
]
.
Recall
that
[
Defined
]
marks
the
theorems
as
%
\
emph
{
transparent
}%,
so
that
the
details
of
their
proofs
may
be
used
during
program
execution
.
Why
could
such
details
possibly
matter
for
computation
?
It
turns
out
that
[
Fix
]
satisfies
the
primitive
recursion
restriction
by
declaring
itself
as
_
recursive
in
the
structure
of
[
Acc
]
proofs_
.
This
is
possible
because
[
Acc
]
proofs
follow
a
predictable
inductive
structure
.
We
must
do
work
,
as
in
the
last
theorem
'
s
proof
,
to
establish
that
all
elements
of
a
type
belong
to
[
Acc
]
,
but
the
automatic
unwinding
of
those
proofs
during
recursion
is
straightforward
.
If
we
ended
the
proof
with
[
Qed
]
,
the
proof
details
would
be
hidden
from
computation
,
in
which
case
the
unwinding
process
would
get
stuck
.
(
**
Notice
that
we
end
these
proofs
with
%
\
index
{
Vernacular
commands
!
Defined
}%
[
Defined
]
,
not
[
Qed
]
.
Recall
that
[
Defined
]
marks
the
theorems
as
%
\
emph
{
%
#
<
i
>
#
transparent
#
</
i
>
#
%
}%,
so
that
the
details
of
their
proofs
may
be
used
during
program
execution
.
Why
could
such
details
possibly
matter
for
computation
?
It
turns
out
that
[
Fix
]
satisfies
the
primitive
recursion
restriction
by
declaring
itself
as
_
recursive
in
the
structure
of
[
Acc
]
proofs_
.
This
is
possible
because
[
Acc
]
proofs
follow
a
predictable
inductive
structure
.
We
must
do
work
,
as
in
the
last
theorem
'
s
proof
,
to
establish
that
all
elements
of
a
type
belong
to
[
Acc
]
,
but
the
automatic
unwinding
of
those
proofs
during
recursion
is
straightforward
.
If
we
ended
the
proof
with
[
Qed
]
,
the
proof
details
would
be
hidden
from
computation
,
in
which
case
the
unwinding
process
would
get
stuck
.
To
justify
our
two
recursive
[
mergeSort
]
calls
,
we
will
also
need
to
prove
that
[
split
]
respects
the
[
lengthOrder
]
relation
.
These
proofs
,
too
,
must
be
kept
transparent
,
to
avoid
stuckness
of
[
Fix
]
evaluation
.
We
use
the
syntax
[
@
foo
]
to
reference
identifier
[
foo
]
with
its
implicit
argument
behavior
turned
off
.
(
The
proof
details
below
use
Ltac
features
not
introduced
yet
,
and
they
are
safe
to
skip
for
now
.
)
*
)
...
...
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