Algebraic and Geometric Topology 1 (2001), paper no. 25, pages 491-502.

The product formula for Lusternik-Schnirelmann category

Joseph Roitberg

Abstract. If C=C_\phi denotes the mapping cone of an essential phantom map \phi from the suspension of the Eilenberg-Mac Lane complex K=K(Z,5) to the 4-sphere S=S^4 we derive the following properties: (1) The LS category of the product of C with any n-sphere S^n is equal to 3; (2) The LS category of the product of C with itself is equal to 3, hence is strictly less than twice the LS category of C. These properties came to light in the course of an unsuccessful attempt to find, for each positive integer m, an example of a pair of 1-connected CW-complexes of finite type in the same Mislin (localization) genus with LS categories m and 2m. If \phi is such that its p-localizations are inessential for all primes p, then by the main result of [J. Roitberg, The Lusternik-Schnirelmann category of certain infinite CW-complexes, Topology 39 (2000), 95-101], the pair C_*, C where C_*= S wedge \Sigma ^2 K, provides such an example in the case m=1.

Keywords. Phantom map, Mislin (localization) genus, Lusternik-Schnirelmann category, Hopf invariant, Cuplength

AMS subject classification. Primary: 55M30.

DOI: 10.2140/agt.2001.1.491

E-print: arXiv:math.AT/0109105

Submitted: 26 October 2000. (Revised: 7 May 2001.) Accepted: 17 August 2001. Published: 10 September 2001.

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Joseph Roitberg
Department of Mathematics and Statistics
Hunter College, CUNY
695 Park Avenue, New York, NY 10021, USA

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