instIsStableUnderBaseChangeJointlySurjectivePrecoverage

English

There is an instance showing stability under base change for jointly surjective precoverage.

Русский

Существует инстанс устойчивости к базовым изменениям для jointlySurjectivePrecoverage.

LaTeX

$$instIsStableUnderBaseChangeJointlySurjectivePrecoverage$$

Lean4

instance : Types.jointlySurjectivePrecoverage.IsStableUnderBaseChange :=
  by
  rw [← Precoverage.comap_id Types.jointlySurjectivePrecoverage]
  apply isStableUnderBaseChange_comap_jointlySurjectivePrecoverage
  intro X Y S f g _
  exact surjective_of_epi _

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