**Algebraic Geometry**

of real numbers, C Dﬁeld of complex numbers, FpDZ=pZ Dﬁeld of pelements, pa prime number. Given an equivalence relation, „“denotes the equivalence class containing . A family of elements of a set Aindexed by a second set I, denoted .ai/ i2I, is a function i7!aiWI!A. We sometimes write jSjfor the number of elements in a ﬁnite set S.

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