Mark Reid on Nostr: Isn’t it just because phi is a solution to x^2 + x - 1 = 0? Circle: y^2 = 1 - x^2 ...Isn’t it just because phi is a solution to x^2 + x - 1 = 0?Circle: y^2 = 1 - x^2Quadratic: y = x^2So y^2 = 1 - y giving the result.