INTRODUCTION TO NONLINEAR PARTIAL DIFFERENTIAL EQUATIONS
www.up.ac.za › media › sharedORIGINS OF PARTIAL DIFFERENTIAL EQUATIONS b) using two functions of a single variable x1(t) = f(t); x2(t) = g(t); where t 2 [t0;t1] (parametric description). Note that since the curve is to be closed, we must have f(t0) = f(t1) and g(t0) = g(t1). In many cases the boundary is composed of a number of arcs so that it is impossible to give a ...