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A product space is compact iff is compact for all . In other words, the topological product of any number of compact spaces is compact. In particular, compactness is a productive property. As a consequence, every Hilbert cube is compact.
This statement implies the axiom of choice, as proven by Kelley (1950).
REFERENCES:
Kelley, J. L. "The Tychonoff Product Theorem Implies the Axiom of Choice." Fund. Math. 37, 75-76, 1950.
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