Carter, Sheila; Craveiro de Carvalho, F.J.(Universitat Politècnica de València, 2008-04-01)
[EN] The cancellation problem, which goes back to S. Ulam, is formulated as follows:
Given topological spaces X, Y, Z, under what circumstances does X × Z ≈Y × Z (≈ meaning homeomorphic to) imply X ≈ Y ?
In it is ...
Carter, Sheila; Craveiro de Carvalho, F.J.(Universitat Politècnica de València, 2004-04-01)
[EN] Up to homeomorphism, there are 9 topologies on a three point set {a, b, c}. Among the resulting topological spaces we have the so called Davey space, where the only non-trivial open set is, let us say, {a}. This is ...