作者mqazz1 (无法显示)
看板Math
标题[代数] ring
时间Sat Feb 19 20:28:25 2011
let A = R+
define addition and multiplication, denoted by ⊕ and ⊙, respectively,
on the set A as follows
for a,b属於A, a⊕b = ab
a⊙b = a^(lgb)
dose the ring have a unity?
what about units?
出处:
http://ppt.cc/i5EM (c)小题
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◆ From: 218.166.115.135
1F：推 calvin4 :suppose the ring have a unity, denoted by e. then 02/19 22:39
2F：→ calvin4 :a⊙e = a^(log e) = a. then you get e. would it be 02/19 22:40
3F：→ calvin4 :true that e⊙b = b? check it. 02/19 22:41