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POTTIER Francois
mpri2.4public
Commits
3e3eabe5
Commit
3e3eabe5
authored
Sep 26, 2017
by
POTTIER Francois
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Added Even.v.
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README.md
View file @
3e3eabe5
...
...
@@ 69,11 +69,12 @@ We also show the limits of dependentlytyped functional programming.
Syntax and operational semantics, on paper and on a machine
(
[
slides 01a
](
slides/fpottier01a.pdf
)
)
(
[
slides 01b
](
slides/fpottier01b.pdf
)
)
(
[
Coq demo
](
coq/DemoSyntaxReduction.v
)
)
(
[
OCaml solution to NewtonRaphson exercise
](
ocaml/NewtonRaphson.ml
)
).
(
[
OCaml solution to NewtonRaphson exercise
](
ocaml/NewtonRaphson.ml
)
)
(
[
Even.v
](
coq/Even.v
)
).
*
(29/09/2017)
From a smallstep semantics down to an efficient interpreter,
in several stages.
in several stages
(
[
Coq demo
](
coq/DemoSyntaxReduction.v
)
).
*
(06/10/2017) Compiling away firstclass functions: closure conversion, defunctionalization.
*
(13/10/2017) Compiling away the call stack: the CPS transformation.
*
(20/10/2017) Equational reasoning and program optimizations.
...
...
coq/Even.v
0 → 100644
View file @
3e3eabe5
(
*
22
/
09
/
2017.
Someone
asked
during
the
course
whether
[
~
(
even
1
)]
can
be
proved
,
and
if
so
,
how
.
Here
are
several
solutions
,
courtesy
of
Pierre

Evariste
Dagand
.
*
)
Inductive
even
:
nat
>
Prop
:=

even_O
:
even
0

even_SS
:
forall
n
,
even
n
>
even
(
S
(
S
n
)).
(
*
1.
The
shortest
proof
uses
the
tactic
[
inversion
]
to
deconstruct
the
hypothesis
[
even
1
],
that
is
,
to
perform
case
analysis
.
The
tactic
automatically
finds
that
this
case
is
impossible
,
so
the
proof
is
finished
.
*
)
Lemma
even1_v1
:
even
1
>
False
.
Proof
.
inversion
1.
(
*
In
case
you
wish
the
see
the
proof
term
:
*
)
(
*
Show
Proof
.
*
)
Qed
.
(
*
For
most
practical
purposes
,
the
above
proof
*
script
*
is
good
enough
,
and
is
most
concise
.
However
,
those
who
wish
to
understand
what
they
are
doing
may
prefer
to
write
a
proof
*
term
*
by
hand
,
in
the
Calculus
of
Inductive
Constructions
,
instead
of
letting
[
inversion
]
construct
a
(
possibly
needlessly
complicated
)
proof
term
.
*
)
(
*
2.
Generalizing
with
equality
.
*
)
Lemma
even1_v2
'
:
forall
n
,
even
n
>
n
=
1
>
False
.
Proof
.
exact
(
fun
n
t
=>
match
t
with

even_O
=>
fun
(
q
:
0
=
1
)
=>
match
q
with
(
*
IMPOSSIBLE
*
)
end

even_SS
n
_
=>
fun
(
q
:
S
(
S
n
)
=
1
)
=>
match
q
with
(
*
IMPOSSIBLE
*
)
end
end
).
Qed
.
Lemma
even1_v2
:
even
1
>
False
.
Proof
.
eauto
using
even1_v2
'
.
Qed
.
(
*
3.
Type

theoretically
,
through
a
large
elimination
.
*
)
Lemma
even1_v3
'
:
forall
n
,
even
n
>
match
n
with

0
=>
True

1
=>
False

S
(
S
_
)
=>
True
end
.
Proof
.
exact
(
fun
n
t
=>
match
t
with

even_O
=>
I

even_SS
_
_
=>
I
end
).
Qed
.
Lemma
even1_v3
:
even
1
>
False
.
Proof
.
apply
even1_v3
'
.
Qed
.
(
*
3
'
.
Same
technique
,
using
a
clever
[
match
...
in
...
return
].
*
)
Lemma
even1_v4
'
:
even
1
>
False
.
Proof
.
exact
(
fun
t
=>
match
t
in
even
n
return
(
match
n
with

0
=>
True

1
=>
False

S
(
S
_
)
=>
True
end
(
*
BUG
:
we
need
the
following
(
pointless
)
type
annotation
*
)
:
Prop
)
with

even_O
=>
I

even_SS
_
_
=>
I
end
).
Qed
.
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