Package set-fold-def: set-fold-def

Information

name	set-fold-def
version	1.13
description	set-fold-def
author	Joe Hurd <joe@gilith.com>
license	HOLLight
provenance	HOL Light theory extracted on 2011-09-21
show	Data.Bool

Files

Package tarball set-fold-def-1.13.tgz
Theory file set-fold-def.thy (included in the package tarball)

Defined Constant

Set
- Set.fold

Theorem

⊦ ∀f b.
    (∀x y s. ¬(x = y) ⇒ f x (f y s) = f y (f x s)) ⇒
    Set.fold f Set.∅ b = b ∧
    ∀x s.
      Set.finite s ⇒
      Set.fold f (Set.insert x s) b =
      if Set.∈ x s then Set.fold f s b else f x (Set.fold f s b)

Input Type Operators

→
bool
Number
- Natural
  - Number.Natural.natural
Set
- Set.set

Input Constants

=
select
Data
- Bool
  - ∀
  - ∧
  - ⇒
  - ∃
  - ∨
  - ¬
  - cond
  - F
  - T
Number
- Natural
  - Number.Natural.suc
  - Number.Natural.zero
Set
- Set.∅
- Set.delete
- Set.finite
- Set.insert
- Set.∈

Assumptions

⊦ T

⊦ Set.finite Set.∅

⊦ F ⇔ ∀p. p

⊦ ∀x. ¬Set.∈ x Set.∅

⊦ ∀t. t ∨ ¬t

⊦ (¬) = λp. p ⇒ F

⊦ (∃) = λP. P ((select) P)

⊦ ∀t. (∃x. t) ⇔ t

⊦ ∀t. (λx. t x) = t

⊦ (∀) = λp. p = λx. T

⊦ ∀x. x = x ⇔ T

⊦ ∀n. ¬(Number.Natural.suc n = 0)

⊦ (⇒) = λp q. p ∧ q ⇔ p

⊦ ∀t. (t ⇔ T) ∨ (t ⇔ F)

⊦ ∀p x. p x ⇒ p ((select) p)

⊦ (¬T ⇔ F) ∧ (¬F ⇔ T)

⊦ ∀x y. x = y ⇒ y = x

⊦ ∀t1 t2. t1 ∨ t2 ⇔ t2 ∨ t1

⊦ ∀s x. Set.finite (Set.delete s x) ⇔ Set.finite s

⊦ ∀s x. Set.finite (Set.insert x s) ⇔ Set.finite s

⊦ (∧) = λp q. (λf. f p q) = λf. f T T

⊦ (∃) = λP. ∀q. (∀x. P x ⇒ q) ⇒ q

⊦ ∀x s. Set.∈ x s ⇔ Set.insert x s = s

⊦ ∀m n. Number.Natural.suc m = Number.Natural.suc n ⇔ m = n

⊦ (∨) = λp q. ∀r. (p ⇒ r) ⇒ (q ⇒ r) ⇒ r

⊦ ∀x s. Set.delete (Set.insert x s) x = s ⇔ ¬Set.∈ x s

⊦ ∀P Q. (∃x. P x) ⇒ Q ⇔ ∀x. P x ⇒ Q

⊦ ∀x y s. Set.delete (Set.delete s x) y = Set.delete (Set.delete s y) x

⊦ ∀s t. s = t ⇔ ∀x. Set.∈ x s ⇔ Set.∈ x t

⊦ ∀P. P 0 ∧ (∀n. P n ⇒ P (Number.Natural.suc n)) ⇒ ∀n. P n

⊦ (∀t. ¬¬t ⇔ t) ∧ (¬T ⇔ F) ∧ (¬F ⇔ T)

⊦ ∀x y s. Set.∈ x (Set.insert y s) ⇔ x = y ∨ Set.∈ x s

⊦ ∀s x y. Set.∈ x (Set.delete s y) ⇔ Set.∈ x s ∧ ¬(x = y)

⊦ ∀e f. ∃fn. fn 0 = e ∧ ∀n. fn (Number.Natural.suc n) = f (fn n) n

⊦ ∀P c x y. P (if c then x else y) ⇔ (c ⇒ P x) ∧ (¬c ⇒ P y)

⊦ ∀t1 t2. (¬(t1 ∧ t2) ⇔ ¬t1 ∨ ¬t2) ∧ (¬(t1 ∨ t2) ⇔ ¬t1 ∧ ¬t2)

⊦ ∀t. ((T ⇔ t) ⇔ t) ∧ ((t ⇔ T) ⇔ t) ∧ ((F ⇔ t) ⇔ ¬t) ∧ ((t ⇔ F) ⇔ ¬t)

⊦ ∀P.
    P Set.∅ ∧
    (∀x s. P s ∧ ¬Set.∈ x s ∧ Set.finite s ⇒ P (Set.insert x s)) ⇒
    ∀s. Set.finite s ⇒ P s

⊦ ∀t. (T ∧ t ⇔ t) ∧ (t ∧ T ⇔ t) ∧ (F ∧ t ⇔ F) ∧ (t ∧ F ⇔ F) ∧ (t ∧ t ⇔ t)

⊦ ∀t. (T ∨ t ⇔ T) ∧ (t ∨ T ⇔ T) ∧ (F ∨ t ⇔ t) ∧ (t ∨ F ⇔ t) ∧ (t ∨ t ⇔ t)

⊦ ∀t. (T ⇒ t ⇔ t) ∧ (t ⇒ T ⇔ T) ∧ (F ⇒ t ⇔ T) ∧ (t ⇒ t ⇔ T) ∧ (t ⇒ F ⇔ ¬t)