HepLean Documentation

Mathlib.Algebra.GCDMonoid.Nat

ℕ and ℤ are normalized GCD monoids. #

Main statements #

Tags #

natural numbers, integers, normalization monoid, gcd monoid, greatest common divisor

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instance instGCDMonoidNat :
GCDMonoid ℕ

ℕ is a gcd_monoid.

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theorem gcd_eq_nat_gcd (m : ℕ) (n : ℕ) :
gcd m n = m.gcd n
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theorem lcm_eq_nat_lcm (m : ℕ) (n : ℕ) :
lcm m n = m.lcm n
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instance instNormalizedGCDMonoidNat :
NormalizedGCDMonoid ℕ
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instance Int.normalizationMonoid :
NormalizationMonoid ℤ
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theorem Int.normUnit_eq (z : ℤ) :
normUnit z = if 0 ≤ z then 1 else -1
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theorem Int.normalize_of_nonneg {z : ℤ} (h : 0 ≤ z) :
normalize z = z
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theorem Int.normalize_of_nonpos {z : ℤ} (h : z ≤ 0) :
normalize z = -z
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theorem Int.normalize_coe_nat (n : ℕ) :
normalize ↑n = ↑n
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theorem Int.abs_eq_normalize (z : ℤ) :
|z| = normalize z
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theorem Int.nonneg_of_normalize_eq_self {z : ℤ} (hz : normalize z = z) :
0 ≤ z
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theorem Int.nonneg_iff_normalize_eq_self (z : ℤ) :
normalize z = z ↔ 0 ≤ z
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theorem Int.eq_of_associated_of_nonneg {a : ℤ} {b : ℤ} (h : Associated a b) (ha : 0 ≤ a) (hb : 0 ≤ b) :
a = b
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instance Int.instGCDMonoid :
GCDMonoid ℤ
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instance Int.instNormalizedGCDMonoid :
NormalizedGCDMonoid ℤ
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theorem Int.coe_gcd (i : ℤ) (j : ℤ) :
↑(i.gcd j) = gcd i j
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theorem Int.coe_lcm (i : ℤ) (j : ℤ) :
↑(i.lcm j) = lcm i j
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theorem Int.natAbs_gcd (i : ℤ) (j : ℤ) :
(gcd i j).natAbs = i.gcd j
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theorem Int.natAbs_lcm (i : ℤ) (j : ℤ) :
(lcm i j).natAbs = i.lcm j
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theorem Int.exists_unit_of_abs (a : ℤ) :
∃ (u : ℤ), ∃ (x : IsUnit u), ↑a.natAbs = u * a
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theorem Int.gcd_eq_natAbs {a : ℤ} {b : ℤ} :
a.gcd b = a.natAbs.gcd b.natAbs
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def associatesIntEquivNat :
Associates ℤ ≃ ℕ

Maps an associate class of integers consisting of -n, n to n : ℕ

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    theorem Int.associated_natAbs (k : ℤ) :
    Associated k ↑k.natAbs
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    theorem Int.associated_iff_natAbs {a : ℤ} {b : ℤ} :
    Associated a b ↔ a.natAbs = b.natAbs
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    theorem Int.associated_iff {a : ℤ} {b : ℤ} :
    Associated a b ↔ a = b ∨ a = -b