Lemma 102: the order clause and clause (1), unconditionally #
The order clause of [Kol07, Lemma 102] (BDCore.lean) and its clause (1) (BDCosupp.lean) were
proved for the construction BDan under the hypothesis PushforwardBridge ψ₀: the push-forward of
a list of centres without empty centres on a closed hypersurface has, as succession of blow-ups, the
push-forward of the succession of the list ([Kol07, 30.3]). This identification is
BlowUpSequence.toSuccession_pushforward
(Hironaka/Manifold/FiniteSuccession/Functor/ToSuccessionPushforward.lean), so both clauses hold
outright.
pushforwardBridge ψ— the identification for every model.BDan_isOfOrder,BDan_cosupp_disjoint— the two clauses of Lemma 102 forBDan.
The push-forward of a list of centres without empty centres along a closed hypersurface has,
as succession of blow-ups, the push-forward of the succession of the list:
BlowUpSequence.toSuccession_pushforward at codimension one.
BD_{n,m,j}(M, 𝓘, E) is a smooth blow-up sequence of order m starting with (M, 𝓘, E)
([Kol07, Lemma 102]; the going-up statement [Kol07, Corollary 85] for the tail): the order clause
BDan_isOfOrder_of_bridge with the identification of the two push-forwards supplied.
The birational transform of E^j at the end of BD_{n,m,j}(M, 𝓘, E) misses the cosupport
{ord I_r ≥ m} ([Kol07, Lemma 102 (1)]): BDan_cosupp_disjoint_of_bridge with the
identification of the two push-forwards supplied.