Cyclotomic completions of polynomial rings

Details Cyclotomic completions of polynomial rings Cyclotomic completions of polynomial rings

2002-09-24

arxiv.org/abs/math/0209324v1

Mathematics

Commutative Algebra

18 pages

Scientific paper

The main object of study in this paper is the completion Z[q]^N=\varprojlim_n Z[q]/((1-q)(1-q^2)...(1-q^n)) of the polynomial ring Z[q], which arises from the study of a new invariant of integral homology 3-spheres with values in Z[q]^N announced by the author, which unifies all the sl_2 Witten-Reshetikhin-Turaev invariants at various roots of unity. We show that any element of Z[q]^N is uniquely determined by its power series expansion in q-\zeta for each root \zeta of unity. We also show that any element of Z[q]^N is uniquely determined by its values at the roots of unity. These results may be interpreted that Z[q]^N behaves like a ring of ``holomorphic functions defined on the set of the roots of unity''. We will also study the generalizations of Z[q]^N, which are completions of the polynomial ring R[q] over a commutative ring R with unit with respect to the linear topologies defined by the principal ideals generated by products of powers of cyclotomic polynomials.

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