Why are second order PDEs so ubiquitous in physics?
75612
Why are differential equations for fields in physics of order two?
125081
What is the reasoning that leads one to postulate this second form for the relativistic particle action?
64608
Why does the higher order derivative test work?
4989
Why are there only derivatives to the first order in the Lagrangian?
105693
How do I solve this PDE?
155043
Substitution $\partial_\mu \to D_\mu \equiv \partial_\mu + ieA_\mu$ allows the introduction of electromagnetic interactions
58345
How discretised PDE forms a matrix (matrix entries question)
95471
Explanation and proof of the 4th order Runge-Kutta method
140666
Solving the Quasilinear PDE $u_{t} - u^2 u_{x} = 0$ with piecewise initial condition.
29952
Time-ordering vs normal-ordering and the two-point function/propagator
96880
How to obtain Hamiltonian formalism and phase space for Lagrangian with second-derivatives?
69945
A PDE exercise from Gilbarg Trudinger. problem 2.2
86407
Why is it differential equations exist on an interval instead of a domain?
90842
Could you recommend some classic textbooks on ordinary/partial differential equation?
133471
Solve a PDE on a domain $\Omega$ with given boundary conditions
138758
Book recommendation on the history of PDE/ODE?
79991
Why second order SGD convergence methods are unpopular for deep learning?