Quelques classes caracteristiques en theorie des nombres

Details Quelques classes caracteristiques en theorie des nombres Quelques classes caracteristiques en theorie des nombres

2000-06-14

arxiv.org/abs/math/0006237v1

Mathematics

Number Theory

Scientific paper

10.1016/S0764-4442(00)00260-3

Let A be an arbitrary ring. We introduce a Dennis trace map mod n, from K_1(A;Z/n) to the Hochschild homology group with coefficients HH_1(A;Z/n). If A is the ring of integers in a number field, explicit elements of K_1(A,Z/n) are constructed and the values of their Dennis trace mod n are computed. If F is a quadratic field, we obtain this way non trivial elements of the ideal class group of A. If F is a cyclotomic field, this trace is closely related to Kummer logarithmic derivatives; this trace leads to an unexpected relationship between the first case of Fermat last theorem, K-theory and the number of roots of Mirimanoff polynomials.

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