Displaying similar documents to “Orientation of absolute space S n .”

Effective chain complexes for twisted products

Marek Filakovský (2012)

Archivum Mathematicum

Similarity:

In the paper weak sufficient conditions for the reduction of the chain complex of a twisted cartesian product F × τ B to a chain complex of free finitely generated abelian groups are found.

A remark on Vapnik-Chervonienkis classes

Agata Smoktunowicz (1997)

Colloquium Mathematicae

Similarity:

We show that the family of all lines in the plane which is a VC class of index 2 cannot be obtained in a finite number of steps starting with VC classes of index 1 and applying the operations of intersection and union. This confirms a common belief among specialists and solves a question asked by several authors.