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1d
answered Necc. and suff. conditions for a canonical transformation.
2d
suggested rejected edit on A catch with Dirac Delta Function
2d
answered An MCQ for finding the extremal of the functional $J = \int_{a}^{b} F(x, y, y^{'})$
2d
comment Integro-differential eigenvalue problem
Crossposted to physics.stackexchange.com/q/185357/2451
2d
revised Laplacians and Dirac delta functions
made clear that the delta functions are 3-dimensional
2d
suggested approved edit on Laplacians and Dirac delta functions
2d
comment Laplacians and Dirac delta functions
A distribution is usually evaluated on an arbitrary test function (within a certain class of functions). The answer (v2) makes no mentioning of test functions.
May
22
comment Laplacians and Dirac delta functions
Comment to the answer (v2): Playing the devil's advocate: The usual divergence theorem assumes that the vector field ${\bf F}$ is $C^1$. But in this case, the vector field ${\bf F}=-\frac{\bf r}{r^3}$ is singular at $r=0$. So how can the use of the divergence theorem be justified?
May
19
awarded  Yearling
May
19
revised Minimizing a functional with a free boundary condition
Minor
May
19
revised Minimizing a functional with a free boundary condition
Added explanation
May
18
answered Minimizing a functional with a free boundary condition
May
18
comment Proving decoupling between generalized coordinates in the lagrangian
Crossposted to physics.stackexchange.com/q/182771/2451
May
18
revised Lagrangians independent of $x$
Added explanation
May
17
answered Lagrangians independent of $x$
May
16
comment Problem on string vibration
Crossposted from physics.stackexchange.com/q/184355/2451
May
16
comment Rotation quaternions and rotation matrix for electron spin
Crossposted to physics.stackexchange.com/q/184368/2451
May
16
revised Maximum value of the integral $\int_0^1e^{|t-x|}dt$ for $0 \leq x \leq 1$
Added explanation
May
16
answered Maximum value of the integral $\int_0^1e^{|t-x|}dt$ for $0 \leq x \leq 1$
May
13
revised Calculus of variations: two integrals
Added explanation