Algebraic Number Theory - download pdf or read online

By Serge Lang

ISBN-10: 0387942254

ISBN-13: 9780387942254

This is a moment variation of Lang's recognized textbook. It covers all the simple fabric of classical algebraic quantity concept, giving the coed the history priceless for the examine of additional issues in algebraic quantity concept, similar to cyclotomic fields, or modular forms.

"Lang's books are constantly of significant price for the graduate pupil and the learn mathematician. This up to date version of Algebraic quantity concept isn't any exception."―-MATHEMATICAL REVIEWS

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Example text

E. converges). Suppose that K is complete, and let E bea finite extension of K. Assume that we have extended the absolute value to E in some way. Since E is a finite dimensional vector space over K, it is easy to verify that all extensions of v to E are equivalent, and we shall recall the proof below. Since two of them are positive powers of each other, and since they coincide on K, we conclude that they must be equal. Thus we get: If K is complete under an absolute value, then an extension of this absolute value to a finite extension is uniquely determined.

W e observe that a series with an E K converges if and only if Iim an= O. n--+oo Thus convergence is easier to deal with than in the archimedean case. We now discuss the possibility of finding roots to certain polynomials in complete fields. Proposition 1. Let m be a positive integer such that m ~O (mod p). Then for any x E P the binomial series of (1 root of 1 + x in o*. + x) l/m converges to an m-th Proof. Obvious, because the binomial coefficients have no p in the denominators. It is frequently necessary to have a more refined criterion for the existence of a root.

B is unramified over p and B

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Algebraic Number Theory by Serge Lang

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