A partial differential equation (PDE) is a mathematical equation that involves multiple independent variables, an unknown function that is dependent on those variables, and partial derivatives of the ...

A partial differential equation (PDE) involves a function $u(x_1, x_2, \dots, x_n)$ and its partial derivatives: $$ F\left(x_1, x_2, \dots, x_n, u, \frac{\partial u ...

The DER statement specifies first or second partial derivatives. By default, analytical derivatives are automatically computed. However, you can specify the derivatives yourself by using the DER.parm ...

Abstract: This article presents a novel partial derivatives expansion (PDE) based on equivalent medium theory for designing frequency selective slabs (FSSlabs) with excellent angular stability in both ...