Inner points and breadth in certain compact semilattices

Author:

Brown D. R.,Stepp J. W.

Abstract

A point x X x \in X is inner if there exists an open set U U containing x x such that for each open set V V with x V U x \in V \subseteq U , the inclusion homomorphism i : {i^* }: : H ( X , X V ) H ( X , X U ) {H^*}(X,X \setminus V) \to {H^*}(X,X \setminus U) is nontrivial. In this note it is proved that, if X X is a compact, chainwise connected topological semilattice of codimension n n , and x x is a point of breadth n + 1 n + 1 , then x x is an inner point.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference15 articles.

1. On the breadth and co-dimension of a topological lattice;Anderson, Lee W.;Pacific J. Math.,1959

2. Compact, distributive lattices of finite breadth;Baker, Kirby A.;Pacific J. Math.,1970

3. Topological semilattices on the two-cell;Brown, Dennison R.;Pacific J. Math.,1965

4. A cohomological definition of dimension for locally compact Hausdorff spaces;Cohen, Haskell;Duke Math. J.,1954

5. A Compendium of Continuous Lattices

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