lift_def — Mathlib

English

A theorem stating the equality of lift with eta_helper under certain definitional equality constraints.

Русский

Теорема о равенстве lift и eta_helper при определенных ограничениях определения.

LaTeX

$$lift_def$$

Lean4

theorem lift_def : eta_helper Eq✝ @lift.{} @(delta% @definition✝) :=
  by
  intros
  delta lift
  rw [show wrapped✝ = ⟨@definition✝.{}, rfl✝⟩ from Subtype.ext✝ wrapped✝.2.symm✝]
  rfl

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