Please classify the following equations as parabolic, elliptic or hyperbolic: 1. 1 = Du - what does this equation describe? 2. u =c-u - what does this equation describe? 3.u +1 =f(x,y) - what does this equation describe? yy Which numerical methods do you know applicable to all of these equations? Are there any differences or caveats in implementation for PDEs of different type