Vector product



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