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b3ec9bd3
Commit
b3ec9bd3
authored
May 26, 2016
by
Robbert Krebbers
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Reorganize prelude/base: group stuff that belongs together.
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prelude/base.v
View file @
b3ec9bd3
...
...
@@ 10,41 +10,19 @@ Global Set Asymmetric Patterns.
From
Coq
Require
Export
Morphisms
RelationClasses
List
Bool
Utf8
Program
Setoid
.
Obligation
Tactic
:
=
idtac
.
(** * General *)
(** Zipping lists. *)
Definition
zip_with
{
A
B
C
}
(
f
:
A
→
B
→
C
)
:
list
A
→
list
B
→
list
C
:
=
fix
go
l1
l2
:
=
match
l1
,
l2
with
x1
::
l1
,
x2
::
l2
=>
f
x1
x2
::
go
l1
l2

_
,
_
=>
[]
end
.
Notation
zip
:
=
(
zip_with
pair
).
(** Ensure that [simpl] unfolds [id], [compose], and [flip] when fully
applied. *)
Arguments
id
_
_
/.
Arguments
compose
_
_
_
_
_
_
/.
Arguments
flip
_
_
_
_
_
_
/.
Arguments
const
_
_
_
_
/.
Typeclasses
Transparent
id
compose
flip
const
.
Instance
:
Params
(@
pair
)
2
.
(** Throughout this development we use [C_scope] for all general purpose
notations that do not belong to a more specific scope. *)
Delimit
Scope
C_scope
with
C
.
Global
Open
Scope
C_scope
.
(** Change [True] and [False] into notations in order to enable overloading.
We will use this in the file [assertions] to give [True] and [False] a
different interpretation in [assert_scope] used for assertions of our axiomatic
semantics. *)
We will use this to give [True] and [False] a different interpretation for
embedded logics. *)
Notation
"'True'"
:
=
True
:
type_scope
.
Notation
"'False'"
:
=
False
:
type_scope
.
Notation
curry
:
=
prod_curry
.
Notation
uncurry
:
=
prod_uncurry
.
Definition
curry3
{
A
B
C
D
}
(
f
:
A
→
B
→
C
→
D
)
(
p
:
A
*
B
*
C
)
:
D
:
=
let
'
(
a
,
b
,
c
)
:
=
p
in
f
a
b
c
.
Definition
curry4
{
A
B
C
D
E
}
(
f
:
A
→
B
→
C
→
D
→
E
)
(
p
:
A
*
B
*
C
*
D
)
:
E
:
=
let
'
(
a
,
b
,
c
,
d
)
:
=
p
in
f
a
b
c
d
.
(** Throughout this development we use [C_scope] for all general purpose
notations that do not belong to a more specific scope. *)
Delimit
Scope
C_scope
with
C
.
Global
Open
Scope
C_scope
.
(** * Equality *)
(** Introduce some Haskell style like notations. *)
Notation
"(=)"
:
=
eq
(
only
parsing
)
:
C_scope
.
Notation
"( x =)"
:
=
(
eq
x
)
(
only
parsing
)
:
C_scope
.
...
...
@@ 56,6 +34,295 @@ Notation "(≠ x )" := (λ y, y ≠ x) (only parsing) : C_scope.
Hint
Extern
0
(
_
=
_
)
=>
reflexivity
.
Hint
Extern
100
(
_
≠
_
)
=>
discriminate
.
Instance
:
@
PreOrder
A
(=).
Proof
.
split
;
repeat
intro
;
congruence
.
Qed
.
(** ** Setoid equality *)
(** We define an operational type class for setoid equality. This is based on
(Spitters/van der Weegen, 2011). *)
Class
Equiv
A
:
=
equiv
:
relation
A
.
Infix
"≡"
:
=
equiv
(
at
level
70
,
no
associativity
)
:
C_scope
.
Notation
"(≡)"
:
=
equiv
(
only
parsing
)
:
C_scope
.
Notation
"( X ≡)"
:
=
(
equiv
X
)
(
only
parsing
)
:
C_scope
.
Notation
"(≡ X )"
:
=
(
λ
Y
,
Y
≡
X
)
(
only
parsing
)
:
C_scope
.
Notation
"(≢)"
:
=
(
λ
X
Y
,
¬
X
≡
Y
)
(
only
parsing
)
:
C_scope
.
Notation
"X ≢ Y"
:
=
(
¬
X
≡
Y
)
(
at
level
70
,
no
associativity
)
:
C_scope
.
Notation
"( X ≢)"
:
=
(
λ
Y
,
X
≢
Y
)
(
only
parsing
)
:
C_scope
.
Notation
"(≢ X )"
:
=
(
λ
Y
,
Y
≢
X
)
(
only
parsing
)
:
C_scope
.
(** The type class [LeibnizEquiv] collects setoid equalities that coincide
with Leibniz equality. We provide the tactic [fold_leibniz] to transform such
setoid equalities into Leibniz equalities, and [unfold_leibniz] for the
reverse. *)
Class
LeibnizEquiv
A
`
{
Equiv
A
}
:
=
leibniz_equiv
x
y
:
x
≡
y
→
x
=
y
.
Lemma
leibniz_equiv_iff
`
{
LeibnizEquiv
A
,
!
Reflexive
(@
equiv
A
_
)}
(
x
y
:
A
)
:
x
≡
y
↔
x
=
y
.
Proof
.
split
.
apply
leibniz_equiv
.
intros
>
;
reflexivity
.
Qed
.
Ltac
fold_leibniz
:
=
repeat
match
goal
with

H
:
context
[
@
equiv
?A
_
_
_
]

_
=>
setoid_rewrite
(
leibniz_equiv_iff
(
A
:
=
A
))
in
H


context
[
@
equiv
?A
_
_
_
]
=>
setoid_rewrite
(
leibniz_equiv_iff
(
A
:
=
A
))
end
.
Ltac
unfold_leibniz
:
=
repeat
match
goal
with

H
:
context
[
@
eq
?A
_
_
]

_
=>
setoid_rewrite
<(
leibniz_equiv_iff
(
A
:
=
A
))
in
H


context
[
@
eq
?A
_
_
]
=>
setoid_rewrite
<(
leibniz_equiv_iff
(
A
:
=
A
))
end
.
Definition
equivL
{
A
}
:
Equiv
A
:
=
(=).
(** A [Params f n] instance forces the setoid rewriting mechanism not to
rewrite in the first [n] arguments of the function [f]. We will declare such
instances for all operational type classes in this development. *)
Instance
:
Params
(@
equiv
)
2
.
(** The following instance forces [setoid_replace] to use setoid equality
(for types that have an [Equiv] instance) rather than the standard Leibniz
equality. *)
Instance
equiv_default_relation
`
{
Equiv
A
}
:
DefaultRelation
(
≡
)

3
.
Hint
Extern
0
(
_
≡
_
)
=>
reflexivity
.
Hint
Extern
0
(
_
≡
_
)
=>
symmetry
;
assumption
.
(** * Type classes *)
(** ** Provable propositions *)
(** This type class collects provable propositions. It is useful to constraint
type classes by arbitrary propositions. *)
Class
PropHolds
(
P
:
Prop
)
:
=
prop_holds
:
P
.
Hint
Extern
0
(
PropHolds
_
)
=>
assumption
:
typeclass_instances
.
Instance
:
Proper
(
iff
==>
iff
)
PropHolds
.
Proof
.
repeat
intro
;
trivial
.
Qed
.
Ltac
solve_propholds
:
=
match
goal
with


PropHolds
(
?P
)
=>
apply
_


?P
=>
change
(
PropHolds
P
)
;
apply
_
end
.
(** ** Decidable propositions *)
(** This type class by (Spitters/van der Weegen, 2011) collects decidable
propositions. For example to declare a parameter expressing decidable equality
on a type [A] we write [`{∀ x y : A, Decision (x = y)}] and use it by writing
[decide (x = y)]. *)
Class
Decision
(
P
:
Prop
)
:
=
decide
:
{
P
}
+
{
¬
P
}.
Arguments
decide
_
{
_
}.
(** ** Inhabited types *)
(** This type class collects types that are inhabited. *)
Class
Inhabited
(
A
:
Type
)
:
Type
:
=
populate
{
inhabitant
:
A
}.
Arguments
populate
{
_
}
_
.
(** ** Proof irrelevant types *)
(** This type class collects types that are proof irrelevant. That means, all
elements of the type are equal. We use this notion only used for propositions,
but by universe polymorphism we can generalize it. *)
Class
ProofIrrel
(
A
:
Type
)
:
Prop
:
=
proof_irrel
(
x
y
:
A
)
:
x
=
y
.
(** ** Common properties *)
(** These operational type classes allow us to refer to common mathematical
properties in a generic way. For example, for injectivity of [(k ++)] it
allows us to write [inj (k ++)] instead of [app_inv_head k]. *)
Class
Inj
{
A
B
}
(
R
:
relation
A
)
(
S
:
relation
B
)
(
f
:
A
→
B
)
:
Prop
:
=
inj
x
y
:
S
(
f
x
)
(
f
y
)
→
R
x
y
.
Class
Inj2
{
A
B
C
}
(
R1
:
relation
A
)
(
R2
:
relation
B
)
(
S
:
relation
C
)
(
f
:
A
→
B
→
C
)
:
Prop
:
=
inj2
x1
x2
y1
y2
:
S
(
f
x1
x2
)
(
f
y1
y2
)
→
R1
x1
y1
∧
R2
x2
y2
.
Class
Cancel
{
A
B
}
(
S
:
relation
B
)
(
f
:
A
→
B
)
(
g
:
B
→
A
)
:
Prop
:
=
cancel
:
∀
x
,
S
(
f
(
g
x
))
x
.
Class
Surj
{
A
B
}
(
R
:
relation
B
)
(
f
:
A
→
B
)
:
=
surj
y
:
∃
x
,
R
(
f
x
)
y
.
Class
IdemP
{
A
}
(
R
:
relation
A
)
(
f
:
A
→
A
→
A
)
:
Prop
:
=
idemp
x
:
R
(
f
x
x
)
x
.
Class
Comm
{
A
B
}
(
R
:
relation
A
)
(
f
:
B
→
B
→
A
)
:
Prop
:
=
comm
x
y
:
R
(
f
x
y
)
(
f
y
x
).
Class
LeftId
{
A
}
(
R
:
relation
A
)
(
i
:
A
)
(
f
:
A
→
A
→
A
)
:
Prop
:
=
left_id
x
:
R
(
f
i
x
)
x
.
Class
RightId
{
A
}
(
R
:
relation
A
)
(
i
:
A
)
(
f
:
A
→
A
→
A
)
:
Prop
:
=
right_id
x
:
R
(
f
x
i
)
x
.
Class
Assoc
{
A
}
(
R
:
relation
A
)
(
f
:
A
→
A
→
A
)
:
Prop
:
=
assoc
x
y
z
:
R
(
f
x
(
f
y
z
))
(
f
(
f
x
y
)
z
).
Class
LeftAbsorb
{
A
}
(
R
:
relation
A
)
(
i
:
A
)
(
f
:
A
→
A
→
A
)
:
Prop
:
=
left_absorb
x
:
R
(
f
i
x
)
i
.
Class
RightAbsorb
{
A
}
(
R
:
relation
A
)
(
i
:
A
)
(
f
:
A
→
A
→
A
)
:
Prop
:
=
right_absorb
x
:
R
(
f
x
i
)
i
.
Class
AntiSymm
{
A
}
(
R
S
:
relation
A
)
:
Prop
:
=
anti_symm
x
y
:
S
x
y
→
S
y
x
→
R
x
y
.
Class
Total
{
A
}
(
R
:
relation
A
)
:
=
total
x
y
:
R
x
y
∨
R
y
x
.
Class
Trichotomy
{
A
}
(
R
:
relation
A
)
:
=
trichotomy
x
y
:
R
x
y
∨
x
=
y
∨
R
y
x
.
Class
TrichotomyT
{
A
}
(
R
:
relation
A
)
:
=
trichotomyT
x
y
:
{
R
x
y
}
+
{
x
=
y
}
+
{
R
y
x
}.
Arguments
irreflexivity
{
_
}
_
{
_
}
_
_
.
Arguments
inj
{
_
_
_
_
}
_
{
_
}
_
_
_
.
Arguments
inj2
{
_
_
_
_
_
_
}
_
{
_
}
_
_
_
_
_
.
Arguments
cancel
{
_
_
_
}
_
_
{
_
}
_
.
Arguments
surj
{
_
_
_
}
_
{
_
}
_
.
Arguments
idemp
{
_
_
}
_
{
_
}
_
.
Arguments
comm
{
_
_
_
}
_
{
_
}
_
_
.
Arguments
left_id
{
_
_
}
_
_
{
_
}
_
.
Arguments
right_id
{
_
_
}
_
_
{
_
}
_
.
Arguments
assoc
{
_
_
}
_
{
_
}
_
_
_
.
Arguments
left_absorb
{
_
_
}
_
_
{
_
}
_
.
Arguments
right_absorb
{
_
_
}
_
_
{
_
}
_
.
Arguments
anti_symm
{
_
_
}
_
{
_
}
_
_
_
_
.
Arguments
total
{
_
}
_
{
_
}
_
_
.
Arguments
trichotomy
{
_
}
_
{
_
}
_
_
.
Arguments
trichotomyT
{
_
}
_
{
_
}
_
_
.
Instance
left_id_propholds
{
A
}
(
R
:
relation
A
)
i
f
:
LeftId
R
i
f
→
∀
x
,
PropHolds
(
R
(
f
i
x
)
x
).
Proof
.
red
.
trivial
.
Qed
.
Instance
right_id_propholds
{
A
}
(
R
:
relation
A
)
i
f
:
RightId
R
i
f
→
∀
x
,
PropHolds
(
R
(
f
x
i
)
x
).
Proof
.
red
.
trivial
.
Qed
.
Instance
left_absorb_propholds
{
A
}
(
R
:
relation
A
)
i
f
:
LeftAbsorb
R
i
f
→
∀
x
,
PropHolds
(
R
(
f
i
x
)
i
).
Proof
.
red
.
trivial
.
Qed
.
Instance
right_absorb_propholds
{
A
}
(
R
:
relation
A
)
i
f
:
RightAbsorb
R
i
f
→
∀
x
,
PropHolds
(
R
(
f
x
i
)
i
).
Proof
.
red
.
trivial
.
Qed
.
Instance
idem_propholds
{
A
}
(
R
:
relation
A
)
f
:
IdemP
R
f
→
∀
x
,
PropHolds
(
R
(
f
x
x
)
x
).
Proof
.
red
.
trivial
.
Qed
.
Lemma
not_symmetry
`
{
R
:
relation
A
,
!
Symmetric
R
}
x
y
:
¬
R
x
y
→
¬
R
y
x
.
Proof
.
intuition
.
Qed
.
Lemma
symmetry_iff
`
(
R
:
relation
A
)
`
{!
Symmetric
R
}
x
y
:
R
x
y
↔
R
y
x
.
Proof
.
intuition
.
Qed
.
Lemma
not_inj
`
{
Inj
A
B
R
R'
f
}
x
y
:
¬
R
x
y
→
¬
R'
(
f
x
)
(
f
y
).
Proof
.
intuition
.
Qed
.
Lemma
not_inj2_1
`
{
Inj2
A
B
C
R
R'
R''
f
}
x1
x2
y1
y2
:
¬
R
x1
x2
→
¬
R''
(
f
x1
y1
)
(
f
x2
y2
).
Proof
.
intros
HR
HR''
.
destruct
(
inj2
f
x1
y1
x2
y2
)
;
auto
.
Qed
.
Lemma
not_inj2_2
`
{
Inj2
A
B
C
R
R'
R''
f
}
x1
x2
y1
y2
:
¬
R'
y1
y2
→
¬
R''
(
f
x1
y1
)
(
f
x2
y2
).
Proof
.
intros
HR'
HR''
.
destruct
(
inj2
f
x1
y1
x2
y2
)
;
auto
.
Qed
.
Lemma
inj_iff
{
A
B
}
{
R
:
relation
A
}
{
S
:
relation
B
}
(
f
:
A
→
B
)
`
{!
Inj
R
S
f
}
`
{!
Proper
(
R
==>
S
)
f
}
x
y
:
S
(
f
x
)
(
f
y
)
↔
R
x
y
.
Proof
.
firstorder
.
Qed
.
Instance
inj2_inj_1
`
{
Inj2
A
B
C
R1
R2
R3
f
}
y
:
Inj
R1
R3
(
λ
x
,
f
x
y
).
Proof
.
repeat
intro
;
edestruct
(
inj2
f
)
;
eauto
.
Qed
.
Instance
inj2_inj_2
`
{
Inj2
A
B
C
R1
R2
R3
f
}
x
:
Inj
R2
R3
(
f
x
).
Proof
.
repeat
intro
;
edestruct
(
inj2
f
)
;
eauto
.
Qed
.
Lemma
cancel_inj
`
{
Cancel
A
B
R1
f
g
,
!
Equivalence
R1
,
!
Proper
(
R2
==>
R1
)
f
}
:
Inj
R1
R2
g
.
Proof
.
intros
x
y
E
.
rewrite
<(
cancel
f
g
x
),
<(
cancel
f
g
y
),
E
.
reflexivity
.
Qed
.
Lemma
cancel_surj
`
{
Cancel
A
B
R1
f
g
}
:
Surj
R1
f
.
Proof
.
intros
y
.
exists
(
g
y
).
auto
.
Qed
.
(** The following lemmas are specific versions of the projections of the above
type classes for Leibniz equality. These lemmas allow us to enforce Coq not to
use the setoid rewriting mechanism. *)
Lemma
idemp_L
{
A
}
f
`
{!@
IdemP
A
(=)
f
}
x
:
f
x
x
=
x
.
Proof
.
auto
.
Qed
.
Lemma
comm_L
{
A
B
}
f
`
{!@
Comm
A
B
(=)
f
}
x
y
:
f
x
y
=
f
y
x
.
Proof
.
auto
.
Qed
.
Lemma
left_id_L
{
A
}
i
f
`
{!@
LeftId
A
(=)
i
f
}
x
:
f
i
x
=
x
.
Proof
.
auto
.
Qed
.
Lemma
right_id_L
{
A
}
i
f
`
{!@
RightId
A
(=)
i
f
}
x
:
f
x
i
=
x
.
Proof
.
auto
.
Qed
.
Lemma
assoc_L
{
A
}
f
`
{!@
Assoc
A
(=)
f
}
x
y
z
:
f
x
(
f
y
z
)
=
f
(
f
x
y
)
z
.
Proof
.
auto
.
Qed
.
Lemma
left_absorb_L
{
A
}
i
f
`
{!@
LeftAbsorb
A
(=)
i
f
}
x
:
f
i
x
=
i
.
Proof
.
auto
.
Qed
.
Lemma
right_absorb_L
{
A
}
i
f
`
{!@
RightAbsorb
A
(=)
i
f
}
x
:
f
x
i
=
i
.
Proof
.
auto
.
Qed
.
(** ** Generic orders *)
(** The classes [PreOrder], [PartialOrder], and [TotalOrder] use an arbitrary
relation [R] instead of [⊆] to support multiple orders on the same type. *)
Definition
strict
{
A
}
(
R
:
relation
A
)
:
relation
A
:
=
λ
X
Y
,
R
X
Y
∧
¬
R
Y
X
.
Instance
:
Params
(@
strict
)
2
.
Class
PartialOrder
{
A
}
(
R
:
relation
A
)
:
Prop
:
=
{
partial_order_pre
:
>
PreOrder
R
;
partial_order_anti_symm
:
>
AntiSymm
(=)
R
}.
Class
TotalOrder
{
A
}
(
R
:
relation
A
)
:
Prop
:
=
{
total_order_partial
:
>
PartialOrder
R
;
total_order_trichotomy
:
>
Trichotomy
(
strict
R
)
}.
(** * Logic *)
Notation
"(∧)"
:
=
and
(
only
parsing
)
:
C_scope
.
Notation
"( A ∧)"
:
=
(
and
A
)
(
only
parsing
)
:
C_scope
.
Notation
"(∧ B )"
:
=
(
λ
A
,
A
∧
B
)
(
only
parsing
)
:
C_scope
.
Notation
"(∨)"
:
=
or
(
only
parsing
)
:
C_scope
.
Notation
"( A ∨)"
:
=
(
or
A
)
(
only
parsing
)
:
C_scope
.
Notation
"(∨ B )"
:
=
(
λ
A
,
A
∨
B
)
(
only
parsing
)
:
C_scope
.
Notation
"(↔)"
:
=
iff
(
only
parsing
)
:
C_scope
.
Notation
"( A ↔)"
:
=
(
iff
A
)
(
only
parsing
)
:
C_scope
.
Notation
"(↔ B )"
:
=
(
λ
A
,
A
↔
B
)
(
only
parsing
)
:
C_scope
.
Hint
Extern
0
(
_
↔
_
)
=>
reflexivity
.
Hint
Extern
0
(
_
↔
_
)
=>
symmetry
;
assumption
.
Lemma
or_l
P
Q
:
¬
Q
→
P
∨
Q
↔
P
.
Proof
.
tauto
.
Qed
.
Lemma
or_r
P
Q
:
¬
P
→
P
∨
Q
↔
Q
.
Proof
.
tauto
.
Qed
.
Lemma
and_wlog_l
(
P
Q
:
Prop
)
:
(
Q
→
P
)
→
Q
→
(
P
∧
Q
).
Proof
.
tauto
.
Qed
.
Lemma
and_wlog_r
(
P
Q
:
Prop
)
:
P
→
(
P
→
Q
)
→
(
P
∧
Q
).
Proof
.
tauto
.
Qed
.
Lemma
impl_transitive
(
P
Q
R
:
Prop
)
:
(
P
→
Q
)
→
(
Q
→
R
)
→
(
P
→
R
).
Proof
.
tauto
.
Qed
.
Instance
:
Comm
(
↔
)
(@
eq
A
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
Comm
(
↔
)
(
λ
x
y
,
@
eq
A
y
x
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
Comm
(
↔
)
(
↔
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
Comm
(
↔
)
(
∧
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
Assoc
(
↔
)
(
∧
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
IdemP
(
↔
)
(
∧
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
Comm
(
↔
)
(
∨
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
Assoc
(
↔
)
(
∨
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
IdemP
(
↔
)
(
∨
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
LeftId
(
↔
)
True
(
∧
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
RightId
(
↔
)
True
(
∧
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
LeftAbsorb
(
↔
)
False
(
∧
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
RightAbsorb
(
↔
)
False
(
∧
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
LeftId
(
↔
)
False
(
∨
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
RightId
(
↔
)
False
(
∨
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
LeftAbsorb
(
↔
)
True
(
∨
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
RightAbsorb
(
↔
)
True
(
∨
).
Proof
.
red
;
intuition
.
Qed
.
Instance
:
LeftId
(
↔
)
True
impl
.
Proof
.
unfold
impl
.
red
;
intuition
.
Qed
.
Instance
:
RightAbsorb
(
↔
)
True
impl
.
Proof
.
unfold
impl
.
red
;
intuition
.
Qed
.
(** * Common data types *)
(** ** Functions *)
Notation
"(→)"
:
=
(
λ
A
B
,
A
→
B
)
(
only
parsing
)
:
C_scope
.
Notation
"( A →)"
:
=
(
λ
B
,
A
→
B
)
(
only
parsing
)
:
C_scope
.
Notation
"(→ B )"
:
=
(
λ
A
,
A
→
B
)
(
only
parsing
)
:
C_scope
.
...
...
@@ 70,141 +337,196 @@ Notation "(∘)" := compose (only parsing) : C_scope.
Notation
"( f ∘)"
:
=
(
compose
f
)
(
only
parsing
)
:
C_scope
.
Notation
"(∘ f )"
:
=
(
λ
g
,
compose
g
f
)
(
only
parsing
)
:
C_scope
.
Notation
"(∧)"
:
=
and
(
only
parsing
)
:
C_scope
.
Notation
"( A ∧)"
:
=
(
and
A
)
(
only
parsing
)
:
C_scope
.
Notation
"(∧ B )"
:
=
(
λ
A
,
A
∧
B
)
(
only
parsing
)
:
C_scope
.
(** Ensure that [simpl] unfolds [id], [compose], and [flip] when fully
applied. *)
Arguments
id
_
_
/.
Arguments
compose
_
_
_
_
_
_
/.
Arguments
flip
_
_
_
_
_
_
/.
Arguments
const
_
_
_
_
/.
Typeclasses
Transparent
id
compose
flip
const
.
Instance
:
Params
(@
pair
)
2
.
Definition
fun_map
{
A
A'
B
B'
}
(
f
:
A'
→
A
)
(
g
:
B
→
B'
)
(
h
:
A
→
B
)
:
A'
→
B'
:
=
g
∘
h
∘
f
.
Instance
const_proper
`
{
R1
:
relation
A
,
R2
:
relation
B
}
(
x
:
B
)
:
Reflexive
R2
→
Proper
(
R1
==>
R2
)
(
λ
_
,
x
).
Proof
.
intros
?
y1
y2
;
reflexivity
.
Qed
.
Instance
id_inj
{
A
}
:
Inj
(=)
(=)
(@
id
A
).
Proof
.
intros
??
;
auto
.
Qed
.
Instance
compose_inj
{
A
B
C
}
R1
R2
R3
(
f
:
A
→
B
)
(
g
:
B
→
C
)
:
Inj
R1
R2
f
→
Inj
R2
R3
g
→
Inj
R1
R3
(
g
∘
f
).
Proof
.
red
;
intuition
.
Qed
.
Instance
id_surj
{
A
}
:
Surj
(=)
(@
id
A
).
Proof
.
intros
y
;
exists
y
;
reflexivity
.
Qed
.
Instance
compose_surj
{
A
B
C
}
R
(
f
:
A
→
B
)
(
g
:
B
→
C
)
:
Surj
(=)
f
→
Surj
R
g
→
Surj
R
(
g
∘
f
).
Proof
.
intros
??
x
.
unfold
compose
.
destruct
(
surj
g
x
)
as
[
y
?].
destruct
(
surj
f
y
)
as
[
z
?].
exists
z
.
congruence
.
Qed
.
Instance
id_comm
{
A
B
}
(
x
:
B
)
:
Comm
(=)
(
λ
_
_
:
A
,
x
).
Proof
.
intros
?
;
reflexivity
.
Qed
.
Instance
id_assoc
{
A
}
(
x
:
A
)
:
Assoc
(=)
(
λ
_
_
:
A
,
x
).
Proof
.
intros
???
;
reflexivity
.
Qed
.
Instance
const1_assoc
{
A
}
:
Assoc
(=)
(
λ
x
_
:
A
,
x
).
Proof
.
intros
???
;
reflexivity
.
Qed
.
Instance
const2_assoc
{
A
}
:
Assoc
(=)
(
λ
_
x
:
A
,
x
).
Proof
.
intros
???
;
reflexivity
.
Qed
.
Instance
const1_idemp
{
A
}
:
IdemP
(=)
(
λ
x
_
:
A
,
x
).
Proof
.
intros
?
;
reflexivity
.
Qed
.
Instance
const2_idemp
{
A
}
:
IdemP
(=)
(
λ
_
x
:
A
,
x
).
Proof
.
intros
?
;
reflexivity
.
Qed
.
(** ** Lists *)
Instance
list_inhabited
{
A
}
:
Inhabited
(
list
A
)
:
=
populate
[].
Definition
zip_with
{
A
B
C
}
(
f
:
A
→
B
→
C
)
:
list
A
→
list
B
→
list
C
:
=
fix
go
l1
l2
:
=
match
l1
,
l2
with
x1
::
l1
,
x2
::
l2
=>
f
x1
x2
::
go
l1
l2

_
,
_
=>
[]
end
.
Notation
zip
:
=
(
zip_with
pair
).
(** ** Booleans *)
(** The following coercion allows us to use Booleans as propositions. *)
Coercion
Is_true
:
bool
>>
Sortclass
.
Hint
Unfold
Is_true
.
Hint
Immediate
Is_true_eq_left
.
Hint
Resolve
orb_prop_intro
andb_prop_intro
.
Notation
"(&&)"
:
=
andb
(
only
parsing
).
Notation
"()"
:
=
orb
(
only
parsing
).
Infix
"&&*"
:
=
(
zip_with
(&&))
(
at
level
40
).
Infix
"*"
:
=
(
zip_with
())
(
at
level
50
).
Instance
bool_inhabated
:
Inhabited
bool
:
=
populate
true
.
Notation
"(∨)"
:
=
or
(
only
parsing
)
:
C_scope
.
Notation
"( A ∨)"
:
=
(
or
A
)
(
only
parsing
)
:
C_scope
.
Notation
"(∨ B )"
:
=
(
λ
A
,
A
∨
B
)
(
only
parsing
)
:
C_scope
.
Definition
bool_le
(
β
1
β
2
:
bool
)
:
Prop
:
=
negb
β
1

β
2
.
Infix
"=.>"
:
=
bool_le
(
at
level
70
).
Infix
"=.>*"
:
=
(
Forall2
bool_le
)
(
at
level
70
).
Instance
:
PartialOrder
bool_le
.
Proof
.
repeat
split
;
repeat
intros
[]
;
compute
;
tauto
.
Qed
.
Notation
"(↔)"
:
=
iff
(
only
parsing
)
:
C_scope
.
Notation
"( A ↔)"
:
=
(
iff
A
)
(
only
parsing
)
:
C_scope
.
Notation
"(↔ B )"
:
=
(
λ
A
,
A
↔
B
)
(
only
parsing
)
:
C_scope
.
Lemma
andb_True
b1
b2
:
b1
&&
b2
↔
b1
∧
b2
.
Proof
.
destruct
b1
,
b2
;
simpl
;
tauto
.
Qed
.
Lemma
orb_True
b1
b2
:
b1

b2
↔
b1
∨
b2
.
Proof
.
destruct
b1
,
b2
;
simpl
;
tauto
.
Qed
.
Lemma
negb_True
b
:
negb
b
↔
¬
b
.
Proof
.
destruct
b
;
simpl
;
tauto
.
Qed
.
Lemma
Is_true_false
(
b
:
bool
)
:
b
=
false
→
¬
b
.
Proof
.
now
intros
>
?.
Qed
.
Hint
Extern
0
(
_
↔
_
)
=>
reflexivity
.
Hint
Extern
0
(
_
↔
_
)
=>
symmetry
;
assumption
.
(** ** Unit *)
Instance
unit_equiv
:
Equiv
unit
:
=
λ
_
_
,
True
.
Instance
unit_equivalence
:
Equivalence
(@
equiv
unit
_
).
Proof
.
repeat
split
.
Qed
.
Instance
unit_inhabited
:
Inhabited
unit
:
=
populate
().
(** ** Products *)
Notation
"( x ,)"
:
=
(
pair
x
)
(
only
parsing
)
:
C_scope
.
Notation
"(, y )"
:
=
(
λ
x
,
(
x
,
y
))
(
only
parsing
)
:
C_scope
.
Notation
"p .1"
:
=
(
fst
p
)
(
at
level
10
,
format
"p .1"
).
Notation
"p .2"
:
=
(
snd
p
)
(
at
level
10
,
format
"p .2"
).
Definition
fun_map
{
A
A'
B
B'
}
(
f
:
A'
→
A
)
(
g
:
B
→
B'
)
(
h
:
A
→
B
)
:
A'
→
B'
:
=
g
∘
h
∘
f
.
Definition
prod_map
{
A
A'
B
B'
}
(
f
:
A
→
A'
)
(
g
:
B
→
B'
)
(
p
:
A
*
B
)
:
A'
*
B'
:
=
(
f
(
p
.
1
),
g
(
p
.
2
)).
Notation
curry
:
=
prod_curry
.
Notation
uncurry
:
=
prod_uncurry
.
Definition
curry3
{
A
B
C
D
}
(
f
:
A
→
B
→
C
→
D
)
(
p
:
A
*
B
*
C
)
:
D
:
=
let
'
(
a
,
b
,
c
)
:
=
p
in
f
a
b
c
.
Definition
curry4
{
A
B
C
D
E
}
(
f
:
A
→
B
→
C
→
D
→
E
)
(
p
:
A
*
B
*
C
*
D
)
:
E
:
=
let
'
(
a
,
b
,
c
,
d
)
:
=
p
in
f
a
b
c
d
.
Definition
prod_map
{
A
A'
B
B'
}
(
f
:
A
→
A'
)
(
g
:
B
→
B'
)
(
p
:
A
*
B
)
:
A'
*
B'
:
=
(
f
(
p
.
1
),
g
(
p
.
2
)).
Arguments
prod_map
{
_
_
_
_
}
_
_
!
_
/.
Definition
prod_zip
{
A
A'
A''
B
B'
B''
}
(
f
:
A
→
A'
→
A''
)
(
g
:
B
→
B'
→
B''
)
(
p
:
A
*
B
)
(
q
:
A'
*
B'
)
:
A''
*
B''
:
=
(
f
(
p
.
1
)
(
q
.
1
),
g
(
p
.
2
)
(
q
.
2
)).
Arguments
prod_zip
{
_
_
_
_
_
_
}
_
_
!
_
!
_
/.
(** Set convenient implicit arguments for [existT] and introduce notations. *)
Arguments
existT
{
_
_
}
_
_
.
Arguments
proj1_sig
{
_
_
}
_
.
Notation
"x ↾ p"
:
=
(
exist
_
x
p
)
(
at
level
20
)
:
C_scope
.
Notation
"` x"
:
=
(
proj1_sig
x
)
(
at
level
10
,
format
"` x"
)
:
C_scope
.
(** * Type classes *)
(** ** Provable propositions *)
(** This type class collects provable propositions. It is useful to constraint
type classes by arbitrary propositions. *)
Class
PropHolds
(
P
:
Prop
)
:
=
prop_holds
:
P
.
Hint
Extern
0
(
PropHolds
_
)
=>
assumption
:
typeclass_instances
.
Instance
:
Proper
(
iff
==>
iff
)
PropHolds
.
Proof
.
repeat
intro
;
trivial
.
Qed
.
Instance
prod_inhabited
{
A
B
}
(
iA
:
Inhabited
A
)
(
iB
:
Inhabited
B
)
:
Inhabited
(
A
*
B
)
:
=
match
iA
,
iB
with
populate
x
,
populate
y
=>
populate
(
x
,
y
)
end
.
Ltac
solve_propholds
:
=
match
goal
with


PropHolds
(
?P
)
=>
apply
_


?P
=>
change
(
PropHolds
P
)
;
apply
_
end
.
Instance
pair_inj
:
Inj2
(=)
(=)
(=)
(@
pair
A
B
).
Proof
.
injection
1
;
auto
.
Qed
.
Instance
prod_map_inj
{
A
A'
B
B'
}
(
f
:
A
→
A'
)
(
g
:
B
→
B'
)
:
Inj
(=)
(=)
f
→
Inj
(=)
(=)
g
→
Inj
(=)
(=)
(
prod_map
f
g
).
Proof
.
intros
??
[??]
[??]
?
;
simpl
in
*
;
f_equal
;
[
apply
(
inj
f
)
apply
(
inj
g
)]
;
congruence
.
Qed
.
(** ** Decidable propositions *)
(** This type class by (Spitters/van der Weegen, 2011) collects decidable
propositions. For example to declare a parameter expressing decidable equality
on a type [A] we write [`{∀ x y : A, Decision (x = y)}] and use it by writing
[decide (x = y)]. *)
Class
Decision
(
P
:
Prop
)
:
=
decide
:
{
P
}
+
{
¬
P
}.
Arguments
decide
_
{
_
}.
Definition
prod_relation
{
A
B
}
(
R1
:
relation
A
)
(
R2
:
relation
B
)
:
relation
(
A
*
B
)
:
=
λ
x
y
,
R1
(
x
.
1
)
(
y
.
1
)
∧
R2
(
x
.
2
)
(
y
.
2
).
Section
prod_relation
.
Context
`
{
R1
:
relation
A
,
R2
:
relation
B
}.
Global
Instance
prod_relation_refl
:
Reflexive
R1
→
Reflexive
R2
→
Reflexive
(
prod_relation
R1
R2
).
Proof
.
firstorder
eauto
.
Qed
.
Global
Instance
prod_relation_sym
:
Symmetric
R1
→
Symmetric
R2
→
Symmetric
(
prod_relation
R1
R2
).
Proof
.
firstorder
eauto
.
Qed
.
Global
Instance
prod_relation_trans
:
Transitive
R1
→
Transitive
R2
→
Transitive
(
prod_relation
R1
R2
).
Proof
.
firstorder
eauto
.
Qed
.
Global
Instance
prod_relation_equiv
:
Equivalence
R1
→
Equivalence
R2
→
Equivalence
(
prod_relation
R1
R2
).
Proof
.
split
;
apply
_
.
Qed
.
Global
Instance
pair_proper'
:
Proper
(
R1
==>
R2
==>
prod_relation
R1
R2
)
pair
.
Proof
.
firstorder
eauto
.
Qed
.
Global
Instance
fst_proper'
:
Proper
(
prod_relation
R1
R2
==>
R1
)
fst
.
Proof
.
firstorder
eauto
.
Qed
.
Global
Instance
snd_proper'
:
Proper
(
prod_relation
R1
R2
==>
R2
)
snd
.
Proof
.
firstorder
eauto
.
Qed
.
End
prod_relation
.
(** ** Inhabited types *)
(** This type class collects types that are inhabited. *)
Class
Inhabited
(
A
:
Type
)
:
Type
:
=
populate
{
inhabitant
:
A
}.
Arguments
populate
{
_
}
_
.
Instance
prod_equiv
`
{
Equiv
A
,
Equiv
B
}
:
Equiv
(
A
*
B
)
:
=
prod_relation
(
≡
)
(
≡
).
Instance
pair_proper
`
{
Equiv
A
,
Equiv
B
}
:
Proper
((
≡
)
==>
(
≡
)
==>
(
≡
))
(@
pair
A
B
)

0
:
=
_
.
Instance
fst_proper
`
{
Equiv
A
,
Equiv
B
}
:
Proper
((
≡
)
==>
(
≡
))
(@
fst
A
B
)
:
=
_
.
Instance
snd_proper
`
{
Equiv
A
,
Equiv
B
}
:
Proper
((
≡
)
==>
(
≡
))
(@
snd
A
B
)
:
=
_
.
Typeclasses
Opaque
prod_equiv
.
Instance
unit_inhabited
:
Inhabited
unit
:
=
populate
().
Instance
bool_inhabated
:
Inhabited
bool
:
=
populate
true
.
Instance
list_inhabited
{
A
}
:
Inhabited
(
list
A
)
:
=
populate
[].