Arjang
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 Mar 15 revised Earth population growth rate is exponential or logarithmic? deleted 57 characters in body Mar 15 comment Earth population growth rate is exponential or logarithmic? just realised the quadratic passing trough the 3 points might not match the function for that interval, if it did then we'd know that segment is a quadratic. is there a way to know that within a recent history the population growth is exponential or logarithmic or quadratic? Mar 15 comment Earth population growth rate is exponential or logarithmic? imagine a monotonically increasing function, starting from 0, as we move along the function, if there are we pass 3 points that are on a straight line then we know we are on a lineaer function, if 3 points are not linear then we can find a quadratic passing through all the 3 points.what do we need to know that the segment is logarithmically increasing or exponentialy increasing? Mar 15 comment Earth population growth rate is exponential or logarithmic? not trying to model. Just trying to get a feel that for example the past 5 years matches exponential growth. but how many individual points I need to say that near past trend matches logarithmic or exponential ? only recent past data (i am leaving out the definition of recent past) Mar 15 asked Earth population growth rate is exponential or logarithmic? Mar 13 awarded Nice Answer Mar 8 comment A square can't be divided into 2 , 3 or 5 smaller squares why is this true for square and not triangle? Feb 29 comment When can a function be represented by an infinite nested radical, a la a Taylor series? good question. not sure if the book modern analysis had anything related Feb 29 revised When can a function be represented by an infinite nested radical, a la a Taylor series? deleted 47 characters in body Feb 29 awarded Altruist Feb 28 comment Prove that the n-sphere equals Euclidean n space plus a point at infinity +1 for "Stereographic projection works in every dimension" info. was that something you learned or something you realised yourself? just wondering about it's origin. Feb 27 awarded Investor Feb 25 comment Closed Form for sum $\sum^{\infty}_{n=1} \frac{1}{3^n+n}$ solve has a different meaning, What i know is not important, i can not prove what i said, so i really should have not said it. In my unproved opinion is too ugly to have a closed form, but math is not about opinions. Feb 25 comment Closed Form for sum $\sum^{\infty}_{n=1} \frac{1}{3^n+n}$ there is nothing to solve, there is not a simple form Feb 18 accepted Is $\lim na_n \to 0$ sufficient for $\sum a_n$ to converge? Feb 11 comment Is there a series to show $22\pi^4>2143\,$? Like the phrase "extends this post" first time seen this, nice Feb 8 comment Find $\lim_{n\to\infty} \frac{1}{n}\left(1+\frac{1}{2}+\frac{1}{3}+\dotsb+\frac{1}{4n-1}+\frac{1}{4n}\right)^5.$ @cncritic : what was the solution? Feb 7 accepted Is there any partial sums of harmonic series that is integer? Feb 7 comment Is there any partial sums of harmonic series that is integer? @Travis , if you could put your two comments into an answer i can accept it. was about to ask how to generate such things next :) you preempted my question Feb 7 comment Is there any partial sums of harmonic series that is integer? yep, the second one, was that obvious to you?