gt6989b

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bio	website	linkedin.com/in/gt6989b
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	2,696 reputation	bio	website	linkedin.com/in/gt6989b	visits	member for	1 year, 8 months
310 badges		location	New York, NY		seen	16 hours ago

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Apr 18	comment	Estimate $\sum_{k=1}^{n} k^{k-1} \binom{n}{k} (n-k)^{n+1-k}$ @joriki Thanks, could not figure out then how to correct it, now I remembered it's 2 parameters, not through a comma. Thanks
Apr 18	comment	Induction proof [ little-o notation ] No, induction only proves for integers. Think about it - if you prove $P_1$ and also that $P_n \implies P_{n+1}$ then together they imply $P_2$ and then $P_3, P_4, \ldots$. But nowhere did we prove $P_\pi$ or $P_{1.5}$, for example
Apr 18	comment	Finding Pi variables from matrix. From PageRank Algorithm. Gaussian Elimination?
Apr 18	comment	Estimate $\sum_{k=1}^{n} k^{k-1} \binom{n}{k} (n-k)^{n+1-k}$ Change index in the identity you are citing from $k$ to $m+1$ so $k-1 \to m$ and convert $\binom{n,m+1}$ to $\binom{n,m}$ by multiplying by the right things, that could clear hings up considerably
Apr 18	comment	Induction proof [ little-o notation ] Induction does not work for reals ($c$ in your case) only integers ($n$ in your case).
Apr 17	revised	Hermitian matrix properties added 17 characters in body
Apr 17	revised	About the weights assigned in the linear regression LaTeX edits
Apr 17	answered	Relations: Reflexive, symmetric, transitive
Apr 16	comment	calculus Population differential equation General solution to an equation is the one that solves the equation with drops all terms without $P(t)$ in it in some form; i.e. $P''(t) + P(t) = \sin t$ becomes $P''(t) + P(t) = 0$. Such equations are called homogeneous and solutions are sometimes called that as well.
Apr 16	comment	calculus Population differential equation You are looking for a differential equation, i.e. some equation for the function $P(t)$ with derivatives. They give you a hint - rate of change of $P$ wrt $t$ is birthrate - deathrate, so what can you say about $P(t)$?
Apr 10	comment	How do you calculate the cost of a number of related values? Perhaps linear programming would help?
Apr 9	comment	Pattern to last three digits of power of $3$? Note sure if it will help but $3^{27} = 3^{3^3}$.
Apr 9	answered	Fragemented linear feature alignment technique
Apr 5	comment	Fragemented linear feature alignment technique so in the input you will provide the coordinates of the endpoints I presume? An on the output, you want the list of items which are collinear (or parallel) grouped together?
Apr 5	comment	Fragemented linear feature alignment technique I'm a bit confused. Could you clarify, or bring an example?
Apr 4	answered	Numerical Method: Approximating an Integral
Apr 4	answered	Find the poisoned pie
Apr 4	reviewed	Approve suggested edit on The null space of $A$ is the plane $x+y=0$ and $T(1,0,0)=(1,1,0)$
Apr 4	answered	A question regarding integrating
Apr 4	comment	Normal distribution help please en.wikipedia.org/wiki/Law_of_large_numbers gives the expected value of the average. en.wikipedia.org/wiki/Central_limit_theorem gives the distribution of the average.