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visits member for 3 years
seen Sep 16 at 18:07

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?
Sep
6
awarded  Yearling
Aug
16
awarded  Revival
Aug
15
comment Why $\vec{r}$ is commonly use for vector equation?
Though obviously false, the following explanation has been popular with my students: It is a verbal joke (which only works in English): since the vector gives your location from the origin, it tells you where you "are".
Aug
7
answered Method Of Characteristics-PDE
Aug
7
comment How can I solve this PDE using change of variables?
One solution is $u(x,y)=0$. Is that enough? Usually a boundary condition is specified along a line or curve.
Jul
27
comment How to find this upper bound to apply Zorn lemma
I think you have to say that the $I$ are open intervals containing $t_0$.
Jul
26
comment How to find this upper bound to apply Zorn lemma
Please specify what kind of sets the domains $I$ are. Also, I would be curious to see why Zorn's lemma is needed for this.