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- ...ication and the group of [[Inverse function|invertible functions]] under [[Function composition|composition]]. Group theory allows one to study such structures in a gener19 KB (3,074 words) - 11:11, 13 February 2009
- ...bre (set theory)|fibre]] over ''Q''. This is indeed an isogeny, and the [[function composition|composite]] <math>\phi \cdot \hat\phi</math> is just multiplication by ''d'4 KB (647 words) - 15:51, 7 February 2009