Walter
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 Mar15 comment Evaluate the line integral of $\frac{1}{z-a}$ over $\gamma$, where $\gamma=a+Re^{it}$, $0\leq t\leq 2\pi$ and a is a complex number A proof was not asked for ... Mar14 comment Pi Day question This is all wrong any way, as it's not 3/14/15: it makes not sense (in this mathematical context) to list month/day/year/hour. You have to be consistent and order the sub-units. Then we get 2015/03/15/09.26.53 etc. Mar14 revised If $\tan\alpha,\, \tan\beta,\,\tan\gamma$ are roots of $au^ 3 +(2a-x)u+ y=0$ use $\tan$ instead of $tan$ Mar14 suggested approved edit on If $\tan\alpha,\, \tan\beta,\,\tan\gamma$ are roots of $au^ 3 +(2a-x)u+ y=0$ Mar14 comment Evaluate the line integral of $\frac{1}{z-a}$ over $\gamma$, where $\gamma=a+Re^{it}$, $0\leq t\leq 2\pi$ and a is a complex number Hint? answer! Mar14 comment Finding extrema of function of two unit vectors @Demosthene yes, of course. so what? Mar14 comment Finding extrema of function of two unit vectors @Demosthene $\hat{\boldsymbol{x}}$ is one of the function arguments and not a constant unit vector. Mar14 asked Finding extrema of function of two unit vectors Sep30 awarded Scholar Sep30 accepted General solution to first-order ODE in 3D Sep29 comment General solution to first-order ODE in 3D thanks. So I learned about the matrix exponential. Great! (I would accept this comment morphed into an answer ...) Sep28 asked General solution to first-order ODE in 3D Sep24 awarded Autobiographer Sep3 comment Analyze rotation of satellite orbit due to transverse acceleration. I've answered this question here. Jun29 comment integral of spherical harmonics over cube I wanted to know the multipole moments of constant density cube. So knowing which vanish is only part of the story. I also need the value for those which don't. Preferrably not the numerical value, but a closed formula. Feb4 comment Wanted: simple invertible function with specified derivative properties @copper.hat Sorry, that fails: $F''(0)\neq0$. Feb3 revised Wanted: simple invertible function with specified derivative properties deleted 9 characters in body Feb3 revised Wanted: simple invertible function with specified derivative properties added 2 characters in body Feb3 revised Wanted: simple invertible function with specified derivative properties added 2 characters in body Feb3 asked Wanted: simple invertible function with specified derivative properties