Package natural-min-max: Natural number min and max functions

Information

Files

• Package tarball natural-min-max-1.7.tgz
• Theory file natural-min-max.thy (included in the package tarball)

Defined Constants

• Number
  • Natural
    • max
    • min
    • minimal

Theorems

⊦ ∀n. max 0 n = n

⊦ ∀n. max n 0 = n

⊦ ∀n. max n n = n

⊦ ∀n. min 0 n = 0

⊦ ∀n. min n 0 = 0

⊦ ∀n. min n n = n

⊦ ∀m n. m ≤ max m n

⊦ ∀m n. n ≤ max m n

⊦ ∀m n. min m n ≤ m

⊦ ∀m n. min m n ≤ n

⊦ ∀m n. max m n = max n m

⊦ ∀m n. min m n = min n m

⊦ ∀m n. max m n = if m ≤ n then n else m

⊦ ∀m n. min m n = if m ≤ n then m else n

⊦ ∀P. (∃n. P n) ⇔ P ((minimal) P) ∧ ∀m. m < (minimal) P ⇒ ¬P m

Input Type Operators

• →
• bool
• Number
  • Natural
    • natural

Input Constants

• =
• select
• Data
  • Bool
    • ∀
    • ∧
    • ⇒
    • ∃
    • ∨
    • ~
    • cond
    • F
    • T
• Number
  • Natural
    • <
    • ≤
    • zero

Assumptions

⊦ T

⊦ ∀n. 0 ≤ n

⊦ ∀n. n ≤ n

⊦ F ⇔ ∀p. p

⊦ (~) = λp. p ⇒ F

⊦ (∃) = λP. P ((select) P)

⊦ ∀t. (∀x. t) ⇔ t

⊦ (∀) = λp. p = λx. T

⊦ ∀x. x = x ⇔ T

⊦ (⇒) = λp q. p ∧ q ⇔ p

⊦ ∀m n. m ≤ n ∨ n ≤ m

⊦ (∧) = λp q. (λf. f p q) = λf. f T T

⊦ ∀m n. m ≤ n ∧ n ≤ m ⇔ m = n

⊦ ∀t1 t2. (if T then t1 else t2) = t1 ∧ (if F then t1 else t2) = t2

⊦ ∀P. (∃n. P n) ⇔ ∃n. P n ∧ ∀m. m < n ⇒ ¬P m

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

⊦ ∀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)