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In topology, the Tychonoff plank is a topological space defined using ordinal spaces that is a counterexample to several plausible-sounding conjectures. It is defined as the topological product of the two ordinal spaces [ 0 , ω ] {\displaystyle [0,\omega ]} and [ 0 , ω 1 ] {\displaystyle [0,\omega _{1}]} , where ω {\displaystyle \omega } is the first infinite...
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