推 feit :(1-ba)(1+b((1-ab)^(-1))a) = ... 03/22 01:59
※ 編輯: k591 來自: 140.127.67.74 (03/22 02:18)
→ k591 :thx :) 03/22 02:22
推 feit :不客氣 03/22 02:23
R is a ring with unity, a,bεR
show that if (1-ab) is a unit, then (1-ba) is a unit.
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consider : b(1-ab) = (1-ba)b
然後該怎麼繼續做下去...?
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