[代數] ring
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
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