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Iris
Iris
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c6b84830
Commit
c6b84830
authored
Dec 03, 2017
by
Robbert Krebbers
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Prove stronger versions of `Persistent (P ∗ Q)` and `Plain (P ∗ Q)`.
parent
1e579d55
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#5705
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theories/bi/derived.v
theories/bi/derived.v
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theories/bi/derived.v
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c6b84830
...
...
@@ 1757,17 +1757,6 @@ Proof.
intros
.
by
rewrite
/
Persistent
{
2
}(
plain
P
)

persistently_impl_plainly
(
persistent
Q
)
(
plainly_elim_absorbingly
P
)
absorbing
.
Qed
.
(* TODO : can we prove this lemma under positivity of the BI (or even
weaker assumptions) ? *)
Global
Instance
wand_persistent
`
{
AffineBI
PROP
}
P
Q
:
Plain
P
→
Persistent
Q
→
Persistent
(
P

∗
Q
).
Proof
.
intros
.
by
rewrite
/
Persistent
{
2
}(
plain
P
)
wand_impl_plainly

persistently_impl_plainly

wand_impl_plainly
(
persistent
Q
)
(
plainly_elim
P
).
Qed
.
Global
Instance
pure_wand_persistent
φ
Q
:
Persistent
Q
→
Absorbing
Q
→
Persistent
(
⌜φ⌝

∗
Q
).
Proof
.
intros
.
rewrite
pure_wand_forall
.
apply
_
.
Qed
.
Global
Instance
sep_persistent
P
Q
:
Persistent
P
→
Persistent
Q
→
Persistent
(
P
∗
Q
).
...
...
@@ 1785,6 +1774,15 @@ Global Instance from_option_persistent {A} P (Ψ : A → PROP) (mx : option A) :
(
∀
x
,
Persistent
(
Ψ
x
))
→
Persistent
P
→
Persistent
(
from_option
Ψ
P
mx
).
Proof
.
destruct
mx
;
apply
_
.
Qed
.
Global
Instance
wand_persistent
P
Q
:
Plain
P
→
Persistent
Q
→
Absorbing
Q
→
Persistent
(
P

∗
Q
).
Proof
.
intros
.
rewrite
/
Persistent
{
2
}(
plain
P
).
trans
(
bi_persistently
(
bi_plainly
P
→
Q
)).

rewrite

persistently_impl_plainly

wand_impl_affinely_plainly
(
persistent
Q
).
by
rewrite
affinely_plainly_elim
.

apply
persistently_mono
,
wand_intro_l
.
by
rewrite
sep_and
impl_elim_r
.
Qed
.
(* Plainness instances *)
Global
Instance
pure_plain
φ
:
Plain
(
⌜φ⌝
%
I
:
PROP
).
Proof
.
by
rewrite
/
Plain
plainly_pure
.
Qed
.
...
...
@@ 1815,16 +1813,14 @@ Proof.
intros
.
by
rewrite
/
Plain
{
2
}(
plain
P
)

plainly_impl_plainly
(
plain
Q
)
(
plainly_elim_absorbingly
P
)
absorbing
.
Qed
.
(* TODO : can we prove this lemma under positivity of the BI (or even
weaker assumptions) ? *)
Global
Instance
wand_plain
`
{
AffineBI
PROP
}
P
Q
:
Plain
P
→
Plain
Q
→
Plain
(
P

∗
Q
).
Global
Instance
wand_plain
P
Q
:
Plain
P
→
Plain
Q
→
Absorbing
Q
→
Plain
(
P

∗
Q
).
Proof
.
intros
.
rewrite
/
Plain
{
2
}(
plain
P
)
wand_impl_plainly

plainly_impl_plainly
.
by
rewrite

wand_impl_plainly
(
plain
Q
)
(
plainly_elim
P
).
intros
.
rewrite
/
Plain
{
2
}(
plain
P
).
trans
(
bi_plainly
(
bi_plainly
P
→
Q
)).

rewrite

plainly_impl_plainly

wand_impl_affinely_plainly
(
plain
Q
).
by
rewrite
affinely_plainly_elim
.

apply
plainly_mono
,
wand_intro_l
.
by
rewrite
sep_and
impl_elim_r
.
Qed
.
Global
Instance
pure_wand_plain
φ
Q
`
{!
Absorbing
Q
}
:
Plain
Q
→
Plain
(
⌜φ⌝

∗
Q
).
Proof
.
intros
?.
rewrite
pure_wand_forall
.
apply
_
.
Qed
.
Global
Instance
sep_plain
P
Q
:
Plain
P
→
Plain
Q
→
Plain
(
P
∗
Q
).
Proof
.
intros
.
by
rewrite
/
Plain

plainly_sep_2
!
plain
.
Qed
.
...
...
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