Package word-bits-thm: Properties of word to bit-list conversions
Information
name | word-bits-thm |
version | 1.64 |
description | Properties of word to bit-list conversions |
author | Joe Hurd <joe@gilith.com> |
license | MIT |
provenance | HOL Light theory extracted on 2012-06-17 |
requires | bool list natural word-bits-def word-def |
show | Data.Bool Data.List Data.Word Data.Word.Bits Number.Natural |
Files
- Package tarball word-bits-thm-1.64.tgz
- Theory file word-bits-thm.thy (included in the package tarball)
Theorems
⊦ ∀w. normal (fromWord w)
⊦ toNatural (toWord []) = 0
⊦ ∀w. toWord (fromWord w) = w
⊦ ∀w. length (fromWord w) = width
⊦ ∀l. toNatural (toWord l) < 2 ↑ length l
⊦ ∀l. length l = width ⇔ fromWord (toWord l) = l
⊦ ∀w1 w2. fromWord w1 = fromWord w2 ⇔ w1 = w2
⊦ ∀w1 w2. fromWord w1 = fromWord w2 ⇒ w1 = w2
⊦ ∀w1 w2. compare ⊥ (fromWord w1) (fromWord w2) ⇔ w1 < w2
⊦ ∀w1 w2. compare ⊤ (fromWord w1) (fromWord w2) ⇔ w1 ≤ w2
⊦ ∀l. width ≤ length l ⇒ fromWord (toWord l) = take width l
⊦ ∀l n. shiftLeft (toWord l) n = toWord (replicate ⊥ n @ l)
⊦ ∀n. toWord (odd n :: fromWord (fromNatural (n div 2))) = fromNatural n
⊦ ∀w n. bit w n ⇔ odd (toNatural w div 2 ↑ n)
⊦ ∀l.
length l ≤ width ⇒
fromWord (toWord l) = l @ replicate ⊥ (width - length l)
⊦ ∀q w1 w2.
compare q (fromWord w1) (fromWord w2) ⇔ if q then w1 ≤ w2 else w1 < w2
⊦ ∀w1 w2. (∀i. i < width ⇒ (bit w1 i ⇔ bit w2 i)) ⇒ w1 = w2
⊦ ∀l. 2 * toNatural (toWord l) + 1 < 2 ↑ suc (length l)
⊦ ∀l n. bit (toWord l) n ⇔ n < width ∧ n < length l ∧ nth l n
⊦ ∀n.
fromNatural n =
toWord
(if n = 0 then [] else odd n :: fromWord (fromNatural (n div 2)))
⊦ ∀l.
fromWord (toWord l) =
if length l ≤ width then l @ replicate ⊥ (width - length l)
else take width l
⊦ ∀h t.
toNatural (toWord (h :: t)) =
(2 * toNatural (toWord t) + if h then 1 else 0) mod modulus
⊦ ∀h t.
2 * toNatural (toWord t) + (if h then 1 else 0) < 2 ↑ suc (length t)
⊦ ∀l n.
length l ≤ width ⇒
shiftRight (toWord l) n =
if length l ≤ n then toWord [] else toWord (drop n l)
⊦ ∀l n.
width ≤ length l ⇒
shiftRight (toWord l) n =
if width ≤ n then toWord [] else toWord (drop n (take width l))
⊦ ∀l n.
shiftRight (toWord l) n =
if length l ≤ width then
if length l ≤ n then toWord [] else toWord (drop n l)
else if width ≤ n then toWord []
else toWord (drop n (take width l))
Input Type Operators
- →
- bool
- Data
- List
- list
- Word
- word
- List
- Number
- Natural
- natural
- Natural
Input Constants
- =
- Data
- Bool
- ∀
- ∧
- ⇒
- ∃
- ∨
- ¬
- cond
- ⊥
- ⊤
- List
- ::
- @
- []
- drop
- interval
- length
- map
- nth
- replicate
- take
- Word
- +
- <
- ≤
- bit
- fromNatural
- modulus
- shiftLeft
- shiftRight
- toNatural
- width
- Bits
- compare
- fromWord
- normal
- toWord
- Bool
- Number
- Natural
- *
- +
- -
- <
- ≤
- ↑
- bit0
- bit1
- div
- even
- mod
- odd
- suc
- zero
- Natural
Assumptions
⊦ ⊤
⊦ ¬(modulus = 0)
⊦ ¬⊥ ⇔ ⊤
⊦ ¬⊤ ⇔ ⊥
⊦ even 0 ⇔ ⊤
⊦ odd 0 ⇔ ⊥
⊦ length [] = 0
⊦ bit0 0 = 0
⊦ ∀t. t ⇒ t
⊦ ∀n. 0 ≤ n
⊦ ∀n. n ≤ n
⊦ ⊥ ⇔ ∀p. p
⊦ toWord [] = 0
⊦ ∀t. t ∨ ¬t
⊦ ∀x. toNatural x < modulus
⊦ ∀m. ¬(m < 0)
⊦ ∀n. 0 < suc n
⊦ ∀n. n < suc n
⊦ ∀n. n ≤ suc n
⊦ (¬) = λp. p ⇒ ⊥
⊦ ∀t. (∀x. t) ⇔ t
⊦ ∀t. (λx. t x) = t
⊦ (∀) = λp. p = λx. ⊤
⊦ ∀x. replicate x 0 = []
⊦ ∀t. ¬¬t ⇔ t
⊦ ∀t. (⊤ ⇔ t) ⇔ t
⊦ ∀t. (t ⇔ ⊤) ⇔ t
⊦ ∀t. ⊥ ∧ t ⇔ ⊥
⊦ ∀t. ⊤ ∧ t ⇔ t
⊦ ∀t. t ∧ ⊥ ⇔ ⊥
⊦ ∀t. t ∧ ⊤ ⇔ t
⊦ ∀t. t ∧ t ⇔ t
⊦ ∀t. ⊥ ⇒ t ⇔ ⊤
⊦ ∀t. ⊤ ⇒ t ⇔ t
⊦ ∀t. t ⇒ ⊤ ⇔ ⊤
⊦ ∀t. ⊥ ∨ t ⇔ t
⊦ ∀t. ⊤ ∨ t ⇔ ⊤
⊦ ∀t. t ∨ ⊥ ⇔ t
⊦ ∀t. t ∨ ⊤ ⇔ ⊤
⊦ ∀x. fromNatural (toNatural x) = x
⊦ ∀n. ¬(suc n = 0)
⊦ ∀n. even n ∨ odd n
⊦ ∀n. 0 * n = 0
⊦ ∀n. 0 + n = n
⊦ ∀m. m + 0 = m
⊦ ∀m. m - 0 = m
⊦ ∀n. n - n = 0
⊦ ∀m. interval m 0 = []
⊦ ∀l. [] @ l = l
⊦ ∀l. drop 0 l = l
⊦ ∀f. map f [] = []
⊦ modulus = 2 ↑ width
⊦ ∀t. (⊥ ⇔ t) ⇔ ¬t
⊦ ∀t. (t ⇔ ⊥) ⇔ ¬t
⊦ ∀t. t ⇒ ⊥ ⇔ ¬t
⊦ ∀q. compare q [] [] ⇔ q
⊦ ∀x. toNatural x div modulus = 0
⊦ ∀n. even (2 * n)
⊦ ∀n. bit1 n = suc (bit0 n)
⊦ ∀n. ¬even n ⇔ odd n
⊦ ∀n. ¬odd n ⇔ even n
⊦ ∀m. m ↑ 0 = 1
⊦ ∀m. m * 1 = m
⊦ ∀n. n ↑ 1 = n
⊦ ∀n. n div 1 = n
⊦ ∀n. n mod 1 = 0
⊦ ∀m. 1 * m = m
⊦ ∀l. take (length l) l = l
⊦ ∀m n. m ≤ m + n
⊦ ∀m n. n ≤ m + n
⊦ (⇒) = λp q. p ∧ q ⇔ p
⊦ ∀t. (t ⇔ ⊤) ∨ (t ⇔ ⊥)
⊦ ∀n. odd (suc (2 * n))
⊦ ∀m. suc m = m + 1
⊦ ∀n. even (suc n) ⇔ ¬even n
⊦ ∀m. m ≤ 0 ⇔ m = 0
⊦ ∀n. toNatural (fromNatural n) = n mod modulus
⊦ ∀l. normal l ⇔ length l = width
⊦ ∀t1 t2. (if ⊥ then t1 else t2) = t2
⊦ ∀t1 t2. (if ⊤ then t1 else t2) = t1
⊦ ∀x n. length (replicate x n) = n
⊦ ∀m n. length (interval m n) = n
⊦ ∀n. 0 < n ⇔ ¬(n = 0)
⊦ ∀n. bit0 (suc n) = suc (suc (bit0 n))
⊦ ∀x y. x = y ⇒ y = x
⊦ ∀h t. nth (h :: t) 0 = h
⊦ ∀t1 t2. t1 ∧ t2 ⇔ t2 ∧ t1
⊦ ∀t1 t2. t1 ∨ t2 ⇔ t2 ∨ t1
⊦ ∀m n. m * n = n * m
⊦ ∀m n. m + n = n + m
⊦ ∀m n. m = n ⇒ m ≤ n
⊦ ∀m n. m < n ⇒ m ≤ n
⊦ ∀m n. m ≤ n ∨ n ≤ m
⊦ ∀m n. m + n - m = n
⊦ ∀f l. length (map f l) = length l
⊦ ∀w. fromWord w = map (bit w) (interval 0 width)
⊦ ∀n. n < modulus ⇒ n mod modulus = n
⊦ ∀n. 2 * n = n + n
⊦ ∀n. n mod modulus mod modulus = n mod modulus
⊦ ∀h t. length (h :: t) = suc (length t)
⊦ ∀m n. ¬(m < n ∧ n ≤ m)
⊦ ∀m n. ¬(m ≤ n ∧ n < m)
⊦ ∀m n. ¬(m < n) ⇔ n ≤ m
⊦ ∀m n. ¬(m ≤ n) ⇔ n < m
⊦ ∀m n. m < suc n ⇔ m ≤ n
⊦ ∀m n. suc m ≤ n ⇔ m < n
⊦ ∀m. m = 0 ∨ ∃n. m = suc n
⊦ (∧) = λp q. (λf. f p q) = λf. f ⊤ ⊤
⊦ ∀n. even n ⇔ n mod 2 = 0
⊦ ∀n. ¬(n = 0) ⇒ 0 mod n = 0
⊦ ∀p. ¬(∀x. p x) ⇔ ∃x. ¬p x
⊦ (∃) = λp. ∀q. (∀x. p x ⇒ q) ⇒ q
⊦ ∀t1 t2. ¬t1 ⇒ ¬t2 ⇔ t2 ⇒ t1
⊦ ∀x y. x < y ⇔ toNatural x < toNatural y
⊦ ∀x y. x ≤ y ⇔ toNatural x ≤ toNatural y
⊦ ∀x y. toNatural x = toNatural y ⇒ x = y
⊦ ∀w n. bit w n ⇔ odd (toNatural (shiftRight w n))
⊦ ∀m n. m < n ⇒ m div n = 0
⊦ ∀m n. m < n ⇒ m mod n = m
⊦ ∀m n. m + suc n = suc (m + n)
⊦ ∀m n. suc m + n = suc (m + n)
⊦ ∀m n. m < m + n ⇔ 0 < n
⊦ ∀m n. suc m = suc n ⇔ m = n
⊦ ∀m n. suc m < suc n ⇔ m < n
⊦ ∀m n. suc m ≤ suc n ⇔ m ≤ n
⊦ ∀m n. m + n = m ⇔ n = 0
⊦ ∀n. odd n ⇔ n mod 2 = 1
⊦ ∀x n. replicate x (suc n) = x :: replicate x n
⊦ ∀m n. even (m * n) ⇔ even m ∨ even n
⊦ ∀m n. even (m + n) ⇔ even m ⇔ even n
⊦ ∀m n. m ↑ suc n = m * m ↑ n
⊦ ∀m n. ¬(n = 0) ⇒ m mod n < n
⊦ ∀m n. ¬(n = 0) ⇒ m div n ≤ m
⊦ ∀m n. ¬(n = 0) ⇒ m mod n ≤ m
⊦ ∀l1 l2. length (l1 @ l2) = length l1 + length l2
⊦ ∀m n. m ≤ n ⇔ ∃d. n = m + d
⊦ (∨) = λp q. ∀r. (p ⇒ r) ⇒ (q ⇒ r) ⇒ r
⊦ ∀m n. m ≤ n ⇔ m < n ∨ m = n
⊦ ∀m n. n ≤ m ⇒ n + (m - n) = m
⊦ ∀m n. n ≤ m ⇒ m - n + n = m
⊦ ∀m n. interval m (suc n) = m :: interval (suc m) n
⊦ ∀m n. m ≤ n ∧ n ≤ m ⇔ m = n
⊦ ∀n l. n ≤ length l ⇒ length (take n l) = n
⊦ ∀p. (∀x y. p x y) ⇔ ∀y x. p x y
⊦ ∀p q. p ∨ (∃x. q x) ⇔ ∃x. p ∨ q x
⊦ ∀x y. toNatural (x + y) = (toNatural x + toNatural y) mod modulus
⊦ ∀m n. ¬(m = 0) ⇒ m * n div m = n
⊦ ∀m n. ¬(m = 0) ⇒ m * n mod m = 0
⊦ ∀x y z. x = y ∧ y = z ⇒ x = z
⊦ ∀x n i. i < n ⇒ nth (replicate x n) i = x
⊦ ∀t1 t2 t3. (t1 ∨ t2) ∨ t3 ⇔ t1 ∨ t2 ∨ t3
⊦ ∀m n p. m * (n * p) = m * n * p
⊦ ∀m n p. m + (n + p) = m + n + p
⊦ ∀m n p. m + n < m + p ⇔ n < p
⊦ ∀m n p. n + m < p + m ⇔ n < p
⊦ ∀m n p. m + n ≤ m + p ⇔ n ≤ p
⊦ ∀m n p. m < n ∧ n < p ⇒ m < p
⊦ ∀m n p. m < n ∧ n ≤ p ⇒ m < p
⊦ ∀m n p. m ≤ n ∧ n < p ⇒ m < p
⊦ ∀m n p. m ≤ n ∧ n ≤ p ⇒ m ≤ p
⊦ ∀l h t. (h :: t) @ l = h :: t @ l
⊦ ∀w n. shiftLeft w n = fromNatural (2 ↑ n * toNatural w)
⊦ ∀w n. shiftRight w n = fromNatural (toNatural w div 2 ↑ n)
⊦ ∀m n. n < m ⇒ suc (m - suc n) = m - n
⊦ ∀m n. n ≤ m ⇒ (m - n = 0 ⇔ m = n)
⊦ ∀m n. m ≤ suc n ⇔ m = suc n ∨ m ≤ n
⊦ ∀m n. m * n = 0 ⇔ m = 0 ∨ n = 0
⊦ ∀f h t. map f (h :: t) = f h :: map f t
⊦ ∀p. p 0 ∧ (∀n. p n ⇒ p (suc n)) ⇒ ∀n. p n
⊦ ∀m n. ¬(n = 0) ⇒ (m div n = 0 ⇔ m < n)
⊦ ∀m n. m ↑ n = 0 ⇔ m = 0 ∧ ¬(n = 0)
⊦ ∀m n i. i < n ⇒ nth (interval m n) i = m + i
⊦ ∀m n p. m * (n + p) = m * n + m * p
⊦ ∀m n p. m ↑ (n + p) = m ↑ n * m ↑ p
⊦ ∀m n. (m mod modulus) * (n mod modulus) mod modulus = m * n mod modulus
⊦ ∀m n. (m mod modulus + n mod modulus) mod modulus = (m + n) mod modulus
⊦ ∀p q. (∀x. p x ∧ q x) ⇔ (∀x. p x) ∧ ∀x. q x
⊦ ∀p q. (∃x. p x) ∨ (∃x. q x) ⇔ ∃x. p x ∨ q x
⊦ ∀m n. ¬(n = 0) ⇒ (m div n) * n + m mod n = m
⊦ ∀p. p [] ∧ (∀h t. p t ⇒ p (h :: t)) ⇒ ∀l. p l
⊦ ∀h t n. n < length t ⇒ nth (h :: t) (suc n) = nth t n
⊦ ∀n h t. n ≤ length t ⇒ drop (suc n) (h :: t) = drop n t
⊦ ∀m n p. m * n = m * p ⇔ m = 0 ∨ n = p
⊦ ∀m n p. m * n ≤ m * p ⇔ m = 0 ∨ n ≤ p
⊦ ∀f l i. i < length l ⇒ nth (map f l) i = f (nth l i)
⊦ ∀m n p. m * n < m * p ⇔ ¬(m = 0) ∧ n < p
⊦ ∀m n p. ¬(n = 0) ⇒ m * (p mod n) mod n = m * p mod n
⊦ ∀m n p. ¬(n * p = 0) ⇒ m div n div p = m div n * p
⊦ ∀m n p. ¬(n * p = 0) ⇒ m mod n * p mod n = m mod n
⊦ ∀n l i. n ≤ length l ∧ i < n ⇒ nth (take n l) i = nth l i
⊦ ∀m n q r. m = q * n + r ∧ r < n ⇒ m div n = q
⊦ ∀m n q r. m = q * n + r ∧ r < n ⇒ m mod n = r
⊦ ∀h t.
toWord (h :: t) =
if h then shiftLeft (toWord t) 1 + 1 else shiftLeft (toWord t) 1
⊦ ∀m n p. ¬(n * p = 0) ⇒ m div n mod p = m mod n * p div n
⊦ ∀l1 l2.
length l1 = length l2 ∧ (∀i. i < length l1 ⇒ nth l1 i = nth l2 i) ⇒
l1 = l2
⊦ ∀q h1 h2 t1 t2.
compare q (h1 :: t1) (h2 :: t2) ⇔
compare (¬h1 ∧ h2 ∨ ¬(h1 ∧ ¬h2) ∧ q) t1 t2
⊦ ∀x m n. x ↑ m ≤ x ↑ n ⇔ if x = 0 then m = 0 ⇒ n = 0 else x = 1 ∨ m ≤ n
⊦ ∀l1 l2 k.
k < length l1 + length l2 ⇒
nth (l1 @ l2) k =
if k < length l1 then nth l1 k else nth l2 (k - length l1)
⊦ ∀a b n.
¬(n = 0) ⇒
((a + b) mod n = a mod n + b mod n ⇔ (a + b) div n = a div n + b div n)