Hello! How can I compute the elements of the vector product? I tried: (%i9) [1,2,3] ~ [4,5,6]; (%o9) [1, 2, 3] ~ [4, 5, 6] (%i10) express(%); (%o10) express([1, 2, 3] ~ [4, 5, 6]) So this express function does not seem to work. Thanks a lot! Matthias