Why is $Q=p$, $P=-q$ a canonical transformation from the perspective of 2 variational principles satisfying boundary conditions?
43154
Modified Hamilton's Principle overconstraining a system by imposing too many boundary conditions
109774
How to obtain the functional derivative in variational inference?
146812
Explicit construction for unitary extensions of completely positive and trace preserving (CPTP) maps?
26658
A proof for $\nabla |u|^p = p\ \text{sgn}(u)|u|^{p-1}\nabla u$.
77318
Why do we consider potential energy function $U(x)$ differentiable?
157191
Conjugate Variables, Noether's Theorem and QM
102943
$f(x)=1/q$ for $x=p/q$ is integrable
128229
Proving that the transformation obtained from an adjoint pair is natural
115224
Equivalences of $\diamondsuit$-principle.
112187
Is there a way to see that $ \nabla_\mu g_{\nu \rho} = 0 $ without explicit computation, where $\nabla_\mu$ refers to the covariant derivative?
108816
$L^p$ integrable but not $L^q$ integrable
17785
Variational Derivation of Schrodinger Equation
126593
How to find out whether a transformation is a canonical transformation?
99285
Why is the change in Hamiltonian for an active infinitesimal canonical transformation defined the way it is?
66919
When/why does the principle of least action plus boundary conditions not uniquely specify a path?
153903
Symmetry condition for continuous coordinate transformations
45061
Physical interpretation of $Q^i = \partial _\nu T^{i \nu}$