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Mar
22
comment Is it possible to find $n$ from the sum forming a polynomial?
Yes, just what I was thinking. Kind of a strange problem.
Mar
22
comment Is it possible to find $n$ from the sum forming a polynomial?
@Nasser I suppose one ought to point out that the computation shows that there is, in fact, no solution.
Feb
11
comment Tricky Probability Question not sure where to start
Is this a question about mathematics or the technical software Mathematica? See mathematica.stackexchange.com/help/on-topic
Jan
24
comment Deriving the Surface Area of a Spherical Triangle
There is a nice proof at math.rice.edu/~pcmi/sphere/gos4.html
Jan
19
awarded  Custodian
Jan
19
reviewed Reviewed Pricing a riskless asset in the Black & Scholes market
Dec
29
awarded  Yearling
Dec
19
awarded  Constituent
Dec
17
comment Derivation: How do I derivate this
Perhaps FullSimplify[SeriesCoefficient[Exp[-y^2], {y, x, n}] n!, Element[n, Integers] && n > 0] (from V. Reshetnikov) or D[F[n][x] Exp[-x^2], x] // Factor is a better hint. But your question seems to be about mathematics, not the technical software Mathematica
Dec
8
awarded  Caucus
Oct
21
comment Notation for sum of products
Is this a question about standard mathematical notation or about how to write code in the software system Mathematica to represent such a sum?
Sep
20
revised Calculating a limit in two variables by going to polar coordinates.
Fixed typo
Sep
20
comment Calculating a limit in two variables by going to polar coordinates.
@Timbuc Yes, thanks!
Sep
18
answered How to find the intersection points of two circles in 3D
Aug
18
answered Log concavity of binomial coefficients: $ \binom{n}{k}^2 \geq \binom{n}{k-1}\binom{n}{k+1} $
Aug
4
comment Negative number modular positive number ?
This question appears to be off-topic because it is about a different programming language than Mathematica or about mathematics. If it about how Mathematica defines the function Mod (not MOD), then why write %?
Jul
26
comment Intuition on the curl formula
@LucasZanella Maxwell observed that the observed properties of the electromagnetic field were similar to the dynamics of rotating fluids in small cells. The book Maxwell on the Electromagnetic Field: A Guided Study contains excerpts that describe how he deduced his equations. Too long to cover the details in a comment, really.
Jul
5
comment Calculating a limit in two variables by going to polar coordinates.
@Crumbs Given: In polar coordinates, $f(x,y) = r \cdot [\cos\theta \sin^2\theta /(\cos^2\theta + r^2\sin^4\theta)]$, $\theta$ fixed, $r \ne 0$, $r \rightarrow 0$. Hence: If $\cos\theta = 0$, then the second factor equals $0$ for all $r$ (given $r \ne 0$); if $\cos\theta \ne 0$, then the limit of the second factor is $\sin^2\theta/\cos\theta$. In both cases the limit of the second factor exists. The first factor approaches $0$, so the limit is $0$.
Jun
6
comment Is there a difference for discount per unit and discount per purchase total?
This question appears to be off-topic because it is not about Mathematica
Apr
29
revised Calculating a limit in two variables by going to polar coordinates.
Responded to downvote