Help for a "Surface and Flux integrals" program

[salvomic]

thank you Arno!
I'm trying, but perhaps I put wrong syntax, as I get always 0, i.e. with z=x^2+y^2, x=u, y=v, z=u^2+y^2, [0,1], [0,2π]...
See image...
Maybe it would be better to use less syntax not using ' ' and the list. As in the linear integral where I used "argv" and "argc" to use something like:
intcur(3*x-4*y+z,[SIN(t), COS(t), t],0,1) or intlin([3*x, 4*y, z], [1, t, t^2], 0, 1)...

Here it could be simply: sfint(x^2+y^2,[u,v,u^2+v^2],[0,1],[0,2π]). What do you think about?

Salvo