Compact subsets of k-spaces (without separation axioms)
Dear Topologists, Categorists and Categorical Topologists, It is well-known that for a *Hausdorff* topological space X, its k-ification kX and X have the same compact subspaces. It is also well-known that when we assume no separation axioms, X and kX have the same k-continuous maps (i.e. maps f:X -->Y such that ft is continuous for every "test-function" t: K --> X, where K is a compact Hausdorff space). I was wondering if anyone knows whether the first statement is true *without separation axioms*, i.e., whether for every topological space X, its k-ification kX and X have the same compact subspaces. I would very much appreciate any suggestion, reference or counterexample. Gabor Lukacs
Gabor Lukacs writes:
I was wondering if anyone knows whether the first statement is true *without separation axioms*, i.e., whether for every topological space X, its k-ification kX and X have the same compact subspaces.
Sometime ago Alex Simpson advertised a paper "Comparing cartesian closed categories of (core) compactly generated spaces". http://www.cs.bham.ac.uk/~mhe/papers/ELS03.pdf where we have the same question (problem 9.2). Hence if anyone has an answer, please forward it to us as well - thanks. (I also take the opportunity to mention that we have updated the paper with some references given to us by some members of this list, in Section 3.) MHE
participants (2)
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Gabor Lukacs -
Martin Escardo