def prod(a, b):
"""product"""
return Vec.sum( Vec.sum( Vec.scal( re(a), im(b) ),
Vec.scal( re(b), im(a) )),
Vec.cross( im(a), im(b) ) ) + [ re(a) * re(b) - Vec.dot( im(a), im(b) ) ]
def prod(a, b):
"""product"""
return Vec.sum(Vec.sum(Vec.scal(re(a), im(b)), Vec.scal(re(b), im(a))),
Vec.cross(im(a),
im(b))) + [re(a) * re(b) - Vec.dot(im(a), im(b))]
