View source for Talk:08-401

something i still unclear on ideal test..

since there are two conditons in ideal test
1. a-b in A whenever a, b in A
2.ra and ar are in A whenever a in A and r in A

i just wonder when i use the ideal test,  i need to use both condtions together 

or just use one of both , then i can conclude a nonempty subset of a ring R is an ideal of R

thx

I would think both need to be satisfied. [[User:Sorin.c|Sorin.c]]

thx so much

now,   i have a tiny question,   is the Z/n equal to Z_n?  are they the same thing.  

because the textbook give us the symbol " Z_n",  and the lecture notes give us " Z/n"

there is any difference? BY the way,  i just uploaded a picture , just follow the link please:

http://katlas.math.toronto.edu/drorbn/index.php?title=Image:08-401.jpg

There is no difference. [[User:Drorbn|Dror]] said he prefers writing <math>\mathbb Z/n</math> instead of <math>\mathbb Z_n</math>.
--[[User:Sorin.c|Sorin.c]] 15:28, 27 January 2008 (EST)