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Aug
28
answered 1D Wave PDE with “strange” Boundary Conditions
Aug
20
answered Space of arbitrary rotations of a cube
Jun
4
comment Integral Definition of Exterior Derivative?
$d\omega$ is defined this way in Hubbard's Vector Calculus book.
Jan
21
comment Is there any “formula” that allows us make change of variables in surface integrals?
I learned about the coarea formula in a lecture, and based on that I worked out the change of variables, so I don't have any references. There are some in the Wikipedia article that I haven't looked at.
Dec
8
awarded  Caucus
Oct
23
answered Are there mathematical contexts where “finite” implicitly means “nonzero?”
Oct
8
answered Confused solving quasilinear PDE
Sep
6
awarded  Yearling
Aug
18
awarded  Informed
May
23
asked Is there a difference between “unity” and 1 in applied mathematics?
Feb
12
answered Vector Delta Function Identity
Feb
12
comment Vector Delta Function Identity
The 1-dimensional version doesn't seem to work for $g(a)=-a$, since $\delta(-a) = \delta(a)$. Also the $n$-dimensional case needs a sum over roots too I think.
Dec
11
comment Norm of a matrix equals greatest eigenvalue
Please add the word "symmetric" in the title.
Nov
3
answered A Neat Rotation Matrix Identity
Sep
25
answered Equivalence of integral and differential forms of transport equation
Sep
22
answered geometrical interpretation of cokernel
Sep
17
answered Is there any “formula” that allows us make change of variables in surface integrals?
Sep
17
answered Surface integral over an inconvenient surface
Sep
13
answered Transformation nonlinear PDE to system of ODE
Sep
13
answered Second order linear homogeneous ODE with constant coefficients and repeated roots. Why second solution needed?