What's special about the $T-V = H- 2V =2 T- H$, which the least action principle extremizes?
42036
Why should an action integral be stationary? On what basis did Hamilton state this principle?
117323
Harmonic Motion
48930
Least-action classical electrodynamics without potentials
126142
Action principle, Lagrangian mechanics, Hamiltonian mechanics, and conservation laws when assuming Aristotelian mechanics $F=mv$
68906
Do the same equations of motion imply the same Lagrangians?
15170
Legendre symbol, second supplementary law
56266
Potential energy and the work energy theorem
88525
Action and Action integral: Different kinds of variational principles
29389
Why does $k/m=\omega^2$ for harmonic motion?
22748
Factor 2 in Heisenberg Uncertainty Principle: Which formula is correct?
38482
What is $\Delta t$ in the time-energy uncertainty principle?
85183
If velocity is constant, how can $p = F\cdot v$ be non zero?
44282
How do I show that there exists variational/action principle for a given classical system?
67323
How to determine the optimal control law?
125081
What is the reasoning that leads one to postulate this second form for the relativistic particle action?
152997
Is there a kind of Noether's theorem for the Hamiltonian formalism?
153238
Simple question on perturbation theory for a function with two small parameters