Prove that the cross ratio of four complex numbers z1, z2, z3, z4 is real if...

Prove that the cross ratio of four complex numbers z1, z2, z3, z4 is real if and only if the points z1, z2, z3, z4 lie on a line or a circle. Then, compute the cross ratio of 1+√ 3, 1−3i, −1 − i and 1 + i and determine whether they lie on a line, a circle, or neither.

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Colby Messinger answered 1 year ago

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