Is *every* planar/2D system integrable?
55905
Find the Hamiltonian given $\dot p$ and $\dot q$
86618
Approximating Riemann integrable functions
45187
Symplectic form on 2-sphere?
89164
When is the graph of the divisor relation on $[n]$ planar?
79180
When can an autonomous system be written using a Hamiltonian?
117010
What does it mean for a Hamiltonian or system to be gapped or gapless?
108816
$L^p$ integrable but not $L^q$ integrable
127049
Can a function be Riemann integrable, but not Lebesgue integrable?
93669
Is every embedded submanifold globally a level set?
153707
Is the Lie bracket of two vector fields well defined?
123230
If $f$ is integrable and bounded over $[\delta,1]$ for all $\delta \in (0,1]$ then is $f$ integrable over all of $[0,1]$ $?$
6267
Matrices: system that is "computationally singular" versus "exactly singular"
52198
Why is every selfadjoint operator closed?
102743
Is there an analog to the Runge-Lenz vector for a 3D spherically symmetric harmonic potential?
5814
Integrability of Thomae's Function on $[0,1]$.
24976
An uniformly charged infinite surface plane
55534
Why one-dimensional strings, but not higher-dimensional shells/membranes?