کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9493242 | 1334228 | 2005 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Divisorial free modules of relative invariants on Krull domains
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
اعداد جبر و تئوری
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
An effective construction of relative invariants plays an important role in the study of finite reflection groups (e.g., [J.E. Humphreys, Reflection Groups and Coxeter Groups, Cambridge Stud. Adv. Math., vol. 29, Cambridge Univ. Press, Cambridge, 1990]). Using a combinatorial method, R.P. Stanley (cf. [R.P. Stanley, Relative invariants of finite groups generated by pseudo-reflections, J. Algebra 49 (1977) 134-148; Invariants of finite groups and their applications to combinatorics, Bull. Amer. Math. Soc. (N.S.) 1 (1979) 475-511]) generalized such classical result to a criterion for a module Sym(V)Ï of invariants of G relative to a character Ï to be Sym(V)G-free of rank one in the case where G is any finite complex subgroup of GL(V). His criterion is useful in invariant theory of finite groups and in combinatorics. In this paper we will study on relative invariants of a group G consisting of automorphisms of a Krull domain R from the view point of a generalized partial result on ramifications in number theory mentioned in [H. Nakajima, Reduced ramification indices of quotient morphisms under torus actions, J. Algebra 242 (2001) 536-549]. We will give a criterion for RÏ to be a free RG-module of rank one for a 1-cocycle Ï of G in the unit group U(R), and consequently establish a criterion for module of relative invariants of a finite central extension of algebraic tori to be free, in terms of local characters, which is similar to one in [H. Nakajima, Relative invariants of finite groups, J. Algebra 79 (1982) 218-234; R.P. Stanley, Relative invariants of finite groups generated by pseudo-reflections, J. Algebra 49 (1977) 134-148].
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Algebra - Volume 292, Issue 2, 15 October 2005, Pages 540-565
Journal: Journal of Algebra - Volume 292, Issue 2, 15 October 2005, Pages 540-565
نویسندگان
Haruhisa Nakajima,