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A function on a product space is said to depend on countably many coordinates if it can be written as a function defined on some countable subproduct composed with the projection onto that subproduct. It is shown, for X a completely regular Hausdorff space having uncountably many nontrivial factors, that each continuous real-valued function on X depends on countably many coordinates if and only if A" is pseudo-Xi-compact. It is also shown that a product space is pseudo-Kicompact if and only ifdoi:10.1090/s0002-9947-1972-0288721-2 fatcat:5m2m6oj6cnaopm5qynvwbsjvai