Is a given word k-avoidable? A word x is called k-avoidable if there exists an infinite word w over a k-letter alphabet such that no morphic image of x occurs in w. For any k, is there a word that is ( k + 1)-avoidable but not k-avoidable?

-- JeffreyShallit - 13 Jul 2011

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Topic revision: r2 - 2018-02-22 - JeffreyShallit
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