一些循环代数函数域的不分明理想类（英文）  

AMBIGUOUS CLASSES OF SOME CYCLIC ALGEBRAIC FUNCTION FIELDS

作　　者：张峰[1] 

机构地区：[1]河北北方学院理学院数学系,河北张家口075000

出　　处：《数学杂志》2015年第5期1035-1041,共7页Journal of Mathematics

基　　金：Supported by National Natural Science Foundation of China(60970153)

摘　　要：本文研究了一些l次循环函数域的理想类群的不分明理想类的结构问题.利用函数域的素理想分解理论和理想的一阶上同调理论,得到了这几类循环函数域的理想类群的l-秩的下界.进一步,我们还得了一些不分明理想类中不含不分明理想的域的充分条件.We study the structure of some kinds of cyclic function fields with degree l. By the means of prime ideal decomposition and the computation of first cohomology of the ideal class group,we get the lower bound of the l-ranks of the class group of these function fields. In addition,we find a necessary condition on when these kinds of fields have ambiguous class containing no ambiguous ideals.

关 键 词：循环函数域 不分明理想类 理想类群 

分 类 号：O156.2[理学—数学]