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A note on $\Xi$-product
\S 1. Introduction.Let $\{X_{\alpha}\}_{\alpha\in A}$ be a family of topological spaces.We denote the box product space by $B_{\alpha}X_{a}$ .For $P\in B_{\alpha}X_{\alpha}$ let $\Xi_{p}$ be the subspace { $x\in B_{\alpha}X_{\alpha}$ : $x_{\alpha}\neq p_{\alpha}$ for at most finitely many $\alpha$ } of $B_{\alpha}X_{\alpha}$ .Recently E. K. van Douwen [4] showed $\Xi_{p}$ is …