[代數] module on Z的一題問題

看板Math作者 (孟新)時間15年前 (2011/02/11 13:21), 編輯推噓0(000)
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Suppose A=[a] is a 2 x 2 matrix with integer entries. Let L be the ij 2 2 module homomorphism from Z to Z given by matrix mulplication by A. 2 2 Suppose Z /L(Z ) is finite. Prove that its order is |a a -a a |. 11 22 12 21 想了好久還是沒有頭緒 請高手幫幫忙 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 128.12.122.176
文章代碼(AID): #1DLCTIC_ (Math)
文章代碼(AID): #1DLCTIC_ (Math)