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...is conjugate to <math>wy</math> and <math>x^j</math> is conjugate to <math>zw^{-1}</math>, then <math> \|x\| \leq \frac{1}{|i+j|} ( \|w\| + \|z\| )</math '''Proof'''. By hypothesis, <math>x^i = s wy s^{-1}</math> and <math>x^j = t zw^{-1} t^{-1}</math> for some <math>s,t</math>. For any natural number <math ...