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The extension of the substitution map of the semigroup of variable words to its Stone–Čech compactification is a homomorphism
Reading the proof of the Hales-Jewett theorem the author defines $W_L$ as the set
of finite words over some alphabet $L$, $W_{L_v}$ as the set of variable-words
over $L$, i.e. finite words over $L \...
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