# Functorial affinization of Nash's manifold

John Atwell Moody

Arxiv ID: 1004.2234•Last updated: 4/14/2020

Let M be a singular irreducible complex manifold of dimension n. There are Q
divisors D[-1], D[0], D[1],...,D[n+1] on Nash's manifold U -> M such that
D[n+1] is relatively ample on bounded sets, D[n] is relatively eventually
basepoint free on bounded sets, and D[-1] is canonical with the same relative
plurigenera as a resolution of M. The divisor D=D[n] is the supremum of
divisors (1/i)D_i. An arc g containing one singular point of M lifts to U if
and only if the generating number of oplus_i O_g(D_i) is finite. When it is
finite it equals 1+(K_U-K) .g where O_U(K) is the pullback mod torsion of
Lambda^n Omega_M. If C is a complete curve in U then (-1/(n+1))K_U .C=D_1 .C +
D_n+2 .C + D_(n+2)^2 .C +..... When there are infinitely many nonzero terms the
sum should be taken formally or p-adically for a prime divisor p of n+2. There
are finitely many nonzero terms if and only if C. D=0. The natural holomorphic
map U -> M factorizes through the contracting map U -> Y_0. If M is bounded,
the Grauert-Riemenschneider sheaf of M is Hom(O_M(D_{(n+2)^i - 1}),
O_M(D_{(n+2)^i})) for large i. If M is projective, singular foliations on M
such that K+(n+1)H is a finitely-generated divisor of Iitaka dimension one are
completely resolvable, where K is the canonical divisor of the foliation and H
is a hyperplane. There are some precise open questions in the article.
According to a question of [7] it is not known whether Y_0 has canonical
singularities.

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