HepLean Documentation

Mathlib.Algebra.Order.Invertible

Lemmas about invOf in ordered (semi)rings. #

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@[simp]
theorem invOf_pos {α : Type u_1} [LinearOrderedSemiring α] {a : α} [Invertible a] :
0 < ⅟a ↔ 0 < a
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@[simp]
theorem invOf_nonpos {α : Type u_1} [LinearOrderedSemiring α] {a : α} [Invertible a] :
⅟a ≤ 0 ↔ a ≤ 0
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@[simp]
theorem invOf_nonneg {α : Type u_1} [LinearOrderedSemiring α] {a : α} [Invertible a] :
0 ≤ ⅟a ↔ 0 ≤ a
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@[simp]
theorem invOf_lt_zero {α : Type u_1} [LinearOrderedSemiring α] {a : α} [Invertible a] :
⅟a < 0 ↔ a < 0
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@[simp]
theorem invOf_le_one {α : Type u_1} [LinearOrderedSemiring α] {a : α} [Invertible a] (h : 1 ≤ a) :
⅟a ≤ 1
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theorem pos_invOf_of_invertible_cast {α : Type u_1} [LinearOrderedSemiring α] [Nontrivial α] (n : ℕ) [Invertible ↑n] :
0 < ⅟↑n