English
The Infimum construction in the quotient setting yields a legitimate DividedPowers on the image ideal, given IsSubDPIdeal hypotheses.
Русский
Полученная конструкцияInf в факторной ситуации образует законную DP-структуру на образующемидеале при гипотезе IsSubDPIdeal.
LaTeX
$$$DividedPowers.Quotient.inf$ (условие) $$
Lean4
/-- When `I ⊓ J` is a sub-dp-ideal of `I`, this is the divided power structure on the ideal
`I(A⧸J)` of the quotient. -/
noncomputable def dividedPowers : DividedPowers (I.map (Ideal.Quotient.mk J)) :=
DividedPowers.Quotient.OfSurjective.dividedPowers hI Ideal.Quotient.mk_surjective (refl _) (isSubDPIdeal_aux hI hIJ)