PX153 - G3 - partial differential equations

• eg:
  • wave equation:
  $$\frac{{\partial }^{2}u}{\partial t^2}=v^2\frac{{\partial }^{2}u}{\partial x^2}$$
  • diffusion equation, $\varphi (x,t)$ is the concentration of diffusing material:
  $$\frac{\partial \varphi }{\partial t}=D\frac{{\partial }^2\varphi }{\partial t^2}$$

\1\n\2\n