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 Yearling
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Jan
12
comment Taylor expansion - How can we deduce that?
Please give more information. If you combine your first two displayed equations $G$ cancels, and all you can deduce is that $G$ is arbitrary and that $r^2 = u^2+v^2$. I assume that is what $r$ means but you haven't said. Unless there is more information about $F$ the statement about $G$ doesn't follow.
Dec
30
answered Asymptotic behaviour / non-linear ODE
Oct
20
answered Does squaring all unitary matrices give the identity matrix?
Sep
13
comment How to solve this pde equation: $(p^2 + q^2)y = qz$
What book is it please?
Sep
6
awarded  Yearling
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.
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