Bob Terrell
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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