推 calvin4 :suppose the ring have a unity, denoted by e. then 02/19 22:39
→ calvin4 :a⊙e = a^(log e) = a. then you get e. would it be 02/19 22:40
→ calvin4 :true that e⊙b = b? check it. 02/19 22:41
let A = R+
define addition and multiplication, denoted by ⊕ and ⊙, respectively,
on the set A as follows
for a,b屬於A, a⊕b = ab
a⊙b = a^(lgb)
dose the ring have a unity?
what about units?
出處: http://ppt.cc/i5EM (c)小題
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 218.166.115.135