Why Are PDEs Categorised In The Way They Are?
131786
Why are second order linear PDEs classified as either elliptic, hyperbolic or parabolic?
42018
Parsing error [bug?] with systems of nonlinear PDEs, Mathematica 12.0.0
71479
Is there some elementary proof of invariance of domain?
23089
Differences between symmetric, Hermitian, self-adjoint, and essentially self-adjoint operators
41666
How to solve a system of PDEs with zip condition?
125026
When does order of partial derivatives matter?
80486
Integrable vs. Non-Integrable systems
119325
Finding the uniquely determined region of a PDE
33278
$\delta$ differential notation
87318
Why are symmetric positive definite (SPD) matrices so important?
142821
Why?$\int_0^1\int_{u(t)}^{u(t)+w(t)} f(t,v(t)) dv dt = \int_0^1 f(t,u(t)+\theta w(t))w(t) dt; ~~\theta\in[0,1] $
114672
Why do we use the Lagrangian and Hamiltonian instead of other related functions?
64230
Is there any intuition or meaning regarding Cauchy-Riemann equations?
99532
Mathematical precise definition of a PDE being elliptic, parabolic or hyperbolic
12726
Differentiating both sides of a non-differential equation
16644
Why does cancellation of dots $\frac{\partial \dot{\mathbf{r}}_i}{\partial \dot{q}_j} = \frac{\partial \mathbf{r}_i}{\partial q_j}$ work?
119399
Solving a PDE containing DiracDelta