The abstract of the talk (see below) may be downloaded in one of the following formats:
Direct products are defined in arbitrary categories and are unique, whenever they exist. In the category H(Top) of topological spaces and homotopy classes of mappings, for any two spaces $X,Y$ their product exists and is given by the Cartesian product $X\times Y$ and by the homotopy classes $[\pi_X]$ and $[\pi_Y]$ of the canonical projections $\pi_X\colon X\times Y\to X$, $\pi_Y\colon X\times Y\to Y$, respectively. Since shape theory is a modification of homotopy theory, it is natural to ask whether in the shape category Sh(Top) the Cartesian product $X\times Y$ and the shape morphisms $S[\pi_X], S[\pi_y]$, induced by $[\pi_X]$ and $[\pi_Y]$, form the direct product of $X$ and $Y$ ? In 1974 J.E. Keesling [1] exhibited a simple (non-compact) space $X\subseteq\R^2$ such that $X\times X$ and the two shape morphisms $S[\pi_X]\colon X\times X\to X$ do not form a product in Sh(Top). However, he gave a positive answer in the case when $X$ and $Y$ are compact Hausdorff spaces. In 1977 Y. Kodama proved that the answer is positive also in the case when $X$ is an FANR (fundamental absolute neighorhood retract) and $Y$ is a paracompact space~[2]. The main aim of the present talk is to announce analogous positive results in strong shape [4], i.e. for the strong shape category SSh(Top) and the strong shape functor $\overline{S}\colon{\rm H(Top)}\to {\rm SSh(Top)}$ (for definitions see [3]).\medskip \begin{thm} If $X$ and $Y$ are compact Hausdorff spaces, then $X\times Y$, $\overline{S}[\pi_X]$ and $\overline{S}[\pi_Y]$ form the product of $X$ and $Y$ in {\rm SSh(Top)}. \end{thm} \begin{thm} If $X$ is an {\rm FANR} and $Y$ is a finite-dimensional space $($more general, a finitistic space$)$, then $X\times Y$, $\overline{S}[\pi_X]$ and $\overline{S}[\pi_Y]$ form the product of $X$ and $Y$ in {\rm SSh(Top)}. \end{thm} \smallskip \begin{thebibliography}{10} \bibitem{Kees74} J.\,E.~Keesling, {\em Products in the shape category and some applications,} Symp.\ Math.\ Istituto Nazionale di Alta Matematica {\bf16} (1973), Academic Press, New York, 1974, 133--142. \bibitem{Koda77} Y.~Kodama, {\em On product of shape and a question of Sher,} Pacific J.~Math.{} {\bf72} (1977), 115--134. \bibitem{Mard2000} S.~Marde\v{s}i\'c, {\em Strong shape and homology,} Springer Monographs in Mathematics, Springer, Berlin 2000. \bibitem{Mard2001} S. Marde\v si\'c, {\em Strong expansions of products and products in strong shape,} (submitted). \end{thebibliography} \vfill\noindent {\it Mathematics Subject Classification\/} 54B35, 54C56, 55P55.\\[10pt] {\it Key words and phrases\/}: inverse limit, strong expansion, homotopy expansion, direct product, shape, strong shape, finitistic space.