Deformation retracts to intersections of Whitney stratifications

Since the ideals defining the Alexander strata of a finitely presented group are computable and rational planes are zero sets of binomial ideals, one can test whether a group could

The proof of a smooth version of the Whitney fibering conjecture for (c)-regular strat- ifications having two strata X < Y that we will give in section 5 (Theorem 3) needs a

We use the proof of Goresky of triangulation of compact abstract stratified sets and the smooth version of the Whitney fibering conjecture, together with its corollary on the

Let R be a commutative ring. A ring R is said to be Gaussian if every polynomial in R[X] is Gaussian. And a domain is Gaussian if and only if it is a Pr¨ ufer domain. It is easy to

Classification math´ ematique par sujets (2000). — Normal form, Singularity, Foliation... Poincar´e proved that the vector field X is actually linear in con- venient

The key result established in this section is a structure theorem for surjective almost small homomorphisms of complete rings in terms of morphisms of DG algebras.. The proof of

Ill, we will construct singular curves over a discrete valuation ring, following Serre's argument, and analyze their generalized Jacobian schemes.. After the preparation

[7] J. MATHER, Stratifications and Mappings, in Dynamical Systems {edited by M. MUNKRES, Elementary differential topology {Annals Study, Vol. THOM, Proprietes differ entielles