Cost
Reciprocal-symmetric cost. Uniqueness of J(x) = ½(x + x⁻¹) − 1, convexity, the Aczél class, and the d'Alembert factorization.
Reciprocal-symmetric cost. Uniqueness of J(x) = ½(x + x⁻¹) − 1, convexity, the Aczél class, and the d'Alembert factorization.