Mathematics – Algebraic Topology
Scientific paper
2001-09-17
Algebr. Geom. Topol. 1 (2001) 491-502
Mathematics
Algebraic Topology
Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol1/agt-1-25.abs.html Version 2: cha
Scientific paper
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.
No associations
LandOfFree
The product formula for Lusternik-Schnirelmann category does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The product formula for Lusternik-Schnirelmann category, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The product formula for Lusternik-Schnirelmann category will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-132661