X 2 2 m 1 x 4m 8 July 8, 2019 16 32 64 128 X 2 2 m 1 x 4m 8 0 1) (m ^ 2 - 2m) ^ 2 - 1 2) 16 - (m ^ 2 + 4m) ^ 2 3) x ^ 2 - 18xy + 81y ^ 2 - z ^ 2 (8m)/(m ^ 2 - 1) / ((m + 1)/(m - 1) - (m - 1)/(m + 1)) (m ^ 2 - 4)/(2m - 4)