Download A Course in Arithmetic 1996 by Jean Pierre Serre PDF

By Jean Pierre Serre

Serre's "A path in mathematics" is a centred, smooth advent to essentially 3 components of quantity concept, quadratic types, Dirichlet's density theorem, and modular types. the 1st variation used to be rather well approved and is now one of many top introductory texts at the complicated undergraduate or starting graduate point. "...The publication is punctiliously written - particularly greatly self-contained. As used to be the purpose of the writer, it's simply available to graduate or perhaps undergraduate scholars, but even the complicated mathematician will get pleasure from examining it. The final bankruptcy, tougher for the newbie, is an advent to modern problems." - "American Scientist".

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A course in arithmetic

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Module of coefficients and module of values. -module M. We let — (f(R)) be the R-module of values of / (generated by the values of / ) , — C(f) be the content module of / (generated by the coefficients of / ) . We want to compare these two submodules of M. First it is clear that we always have a containment: 14 I. 17. Let R be a ring, M be an R-module and f be a polynomial with coefficients in M. Then (f(R)} Q C(f). 18. Let R be a ring, M be an R-module and f be a polynomial of degree n with coefficients in M.

Similar results may be obtained in the case of function fields. 25 II. ADDITIVE STRUCTURE 26 I I. 1. Characteristic ideals Let B be a domain such that D[X] C B C K[X]. }. If B = Int(D) we often write 3n instead of 3n{B). )} nG j^ is an increasing sequence of D-modules. -CK and, for each n and m G N, 3n(£)3m(£) C Jn-\-m (B). Fractional ideals. Recall that a fractional ideal of D is a D-submodule 3 of if which is a fractional subset, that is, there exists a nonzero element doiD such that d3 is an integral ideal of D.

I) Similarly, one can prove that if G is a set of polynomials of By such that, for each n, the leading coefficients of the polynomials of degree n in G generate the D-module 3n(B), then G is a system of generators of the Z)-module B [Exercise 5]. For example, if D is a Dedekind domain, every ideal can be generated by two elements, one of which can be chosen to be an arbitrary nonzero element in this ideal. We thus obtain a system of generators of Int(D) with two polynomials for each degree n, one of them being an arbitrary polynomial of degree n in Int(D), for instance Xn.

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