Package natural-factorial-thm: Properties of natural number factorial
Information
| name | natural-factorial-thm |
| version | 1.12 |
| description | Properties of natural number factorial |
| author | Joe Hurd <joe@gilith.com> |
| license | HOLLight |
| provenance | HOL Light theory extracted on 2011-11-27 |
| requires | bool natural-def natural-numeral natural-order natural-add natural-mult natural-factorial-def |
| show | Data.Bool Number.Natural |
Files
- Package tarball natural-factorial-thm-1.12.tgz
- Theory file natural-factorial-thm.thy (included in the package tarball)
Theorems
⊦ ∀n. ¬(factorial n = 0)
⊦ ∀m n. m ≤ n ⇒ factorial m ≤ factorial n
Input Type Operators
- →
- bool
- Number
- Natural
- natural
- Natural
Input Constants
- =
- Data
- Bool
- ∀
- ∧
- ⇒
- ∃
- ∨
- ¬
- T
- Bool
- Number
- Natural
- *
- +
- <
- ≤
- bit0
- bit1
- factorial
- suc
- zero
- Natural
Assumptions
⊦ T
⊦ bit0 0 = 0
⊦ ∀n. 0 ≤ n
⊦ ∀n. n ≤ n
⊦ factorial 0 = 1
⊦ ∀n. 0 < suc n
⊦ ∀t. (∀x. t) ⇔ t
⊦ (∀) = λp. p = λx. T
⊦ ∀t. T ∧ t ⇔ t
⊦ ∀t. t ∧ T ⇔ t
⊦ ∀t. T ∨ t ⇔ T
⊦ ∀m. m + 0 = m
⊦ ∀n. bit1 n = suc (bit0 n)
⊦ ∀m. 1 * m = m
⊦ (⇒) = λp q. p ∧ q ⇔ p
⊦ ∀n. 0 < n ⇔ ¬(n = 0)
⊦ ∀n. factorial (suc n) = suc n * factorial n
⊦ (∧) = λp q. (λf. f p q) = λf. f T T
⊦ (∃) = λP. ∀q. (∀x. P x ⇒ q) ⇒ q
⊦ ∀m n. m + suc n = suc (m + n)
⊦ ∀m n. suc m ≤ suc n ⇔ m ≤ n
⊦ ∀m n. m ≤ n ⇔ ∃d. n = m + d
⊦ ∀m n p. m ≤ n ∧ n ≤ p ⇒ m ≤ p
⊦ ∀m n. 0 < m * n ⇔ 0 < m ∧ 0 < n
⊦ ∀P. P 0 ∧ (∀n. P n ⇒ P (suc n)) ⇒ ∀n. P n
⊦ ∀m n p. m * p ≤ n * p ⇔ m ≤ n ∨ p = 0