Why are periodic boundary conditions used for the derivation of phonons?
94041
Interpretation Born-Von Karman boundary conditions
109091
Why do non-constant periodic functions have no limit at infinity?
17120
Why use Fourier expansion in Quantum Field Theory?
24903
Connection between Schrödinger equation and heat equation
54197
Why are the energy levels of a simple harmonic oscillator equally spaced?
2451
Minimum Uncertainty Wavefunction derivation
107070
Fourier transform standard practice for physics
43154
Modified Hamilton's Principle overconstraining a system by imposing too many boundary conditions
116718
Motivating the ansatz for the infinitesimal translation operator
131091
Srednicki's Path Integrals: Ground-State to Ground-State Transition Amplitude in the Presence of a Perturbation
95471
Explanation and proof of the 4th order Runge-Kutta method
114562
Boundary conditions for calculus of variations in phase space and under canonical transformations
53616
Boundary condition with spatial derivative is ignored by NDSolve
30152
Derivation of time-dependent Schrödinger equation from De Broglie hypothesis
158927
How to solve 1D heat equation with Neumann boundary conditions?
89863
2D Heat equation: inconsistent boundary and initial conditions
154508
The energy method for $u_{tt}-du_t-u_{xx}=0, (0,1)\times(0,T) $