0925132人目の素数さん垢版 | 大砲2019/08/16(金) 16:31:57.68ID:oNtuWoss >>920 (A+B)^2 = E, (A-B)^2 = -E, より A+B = [ p, 0 ] [ 0, r ] ここに p=±1, r=±1, A-B = [ 0, q ] [-q, 0 ] ここに q=±1, よって A = (1/2)[ p, q ] [-q, r ] B = (1/2)[ p, -q ] [ q, r ]