The Kummer surfaces are a family of quartic surfaces given by the algebraic equation (x^2 + y^2 + z^2 - μ^2 w^2)^2 - λ p q r s = 0, where λ congruent (3μ^2 - 1)/(3 - μ^2), p, q, r, and s are the tetrahedral coordinates p | = | w - z - sqrt(2)x q | = | w - z + sqrt(2)x r | = | w + z + sqrt(2)y s | = | w + z - sqrt(2)y,