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'''Proof.'''
By definition, for any integer <math>k</math> with <math>\gcd(k,b) = 1</math> (and thus also <math>\gcd(k,a) = 1</math>), we have that <math> b \,|\, (k^{\lambda(b)} - 1)</math> , and therefore <math> a \,|\, (k^{\lambda(b)} - 1)</math>. By the minimality property above, we have <math> \lambda(a)\,|\,\lambda(b) </math>.
===Composition===
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