0937132人目の素数さん垢版 | 大砲2019/08/16(金) 18:43:04.19ID:oNtuWoss >>920 (A+B)^2 = E, (A-B)^2 = -E, より A+B = [ 0, s ] [ 1/s, 0 ] A-B = [ 0, t ] [ -1/t, 0] ここに st≠0, よって A = (1/2)[ 0, s+t ] [1/s -1/t, 0 ] B = (1/2)[ 0, s-t ] [ 1/s +1/t, 0 ]