I have to agree. I found the answers to be mostly after-the-fact justifications, rather painful to read in fact. Sure, y = sin(x) is well modeled as having on

I have to agree. I found the answers to be mostly after-the-fact justifications, rather painful to read in fact. Sure, y = sin(x) is well modeled as having one output, but there are plenty of multi-output functions, even in math. A few that come to mind are: Modulus calculations like a,b = mod(x,n) where a is the remainder modulo n, and b is the residual, so that x = a + b*n. The two outputs from the quadratic formula. All the matrix factorizations, such as L,U,P = lu(A) where A = P L U, and L and U are triangular, and P is a permutation. The remedy of having a data structure to hold the a and b integers above, or the two roots of a quadratic equation, is asinine.