1. The problem statement, all variables and given/known data given is the following field [tex] F(x,y,z)=(y,xz,0)[/tex] (F is a vector field) and the borders of the surface are: [tex] 0<x<1 ;y=x ; 0<z<1[/tex] the < should be less equal but I don't know how to do the sign in latex, sorry. The normal vector is given as [tex]n=(a,b,c); b<0[/tex] I shall calculate the flow through the surface 2. Relevant equations the formula for the flow, can't type in in latex, sorry, but I think you know which one I mean (flow= integral F*n*dS) 3. The attempt at a solution I need to find my dS, problem here I have, I don't know how to do this exactly. I tried to parametrize it, but I'm not sure how to do it, because I have a function in my borders. So I think y max equals 1 because of the requirements for x. Can anyone help me?