hasSum_unop — Mathlib

English

The hasSum-unop symmetry: HasSum (unop ∘ f) (unop a) ⇔ HasSum f a.

Русский

Симметрия HasSum и unop: HasSum (unop ∘ f) (unop a) ⇔ HasSum f a.

LaTeX

$$$\\operatorname{HasSum}(\\lambda a, \\operatorname{unop}(f a)) (\\operatorname{unop} a) L \\iff \\operatorname{HasSum} f a L$$$

Lean4

@[simp]
theorem hasSum_unop {f : β → αᵐᵒᵖ} {a : αᵐᵒᵖ} : HasSum (fun a ↦ unop (f a)) (unop a) L ↔ HasSum f a L :=
  ⟨HasSum.op, HasSum.unop⟩

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