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Don't have much time these days...


Aug
5
revised Elementary proof there are infinitely many primes of the form $4n+1$
edited tags
Jul
31
revised How prove $7\mid abcd$, if $a^{14}+b^{14}+c^{14}=d^{14}$
edited tags
Jul
30
awarded  Guru
Jul
28
comment How prove $\sqrt{r^2+c^2}$ is irrational
Tagging this is elementary-number-theory until proven otherwise.
Jul
28
revised How prove $\sqrt{r^2+c^2}$ is irrational
edited tags
Jul
27
comment Find the pair of values $a[i]$, $a[j]$ such that $a[i]\,\&\,a[j]$ is maximum
@900sit-upsaday: Thanks, I have cast my dupe vote there.
Jul
27
comment Find the pair of values $a[i]$, $a[j]$ such that $a[i]\,\&\,a[j]$ is maximum
You haven't clarified the bitwise AND part (this is a mathematics site :-)). Also, as written, the question gives the impression that you haven't put any effort into it, which clearly isn't true. Why not edit the question and put in some motivation and your ideas and requirement of a linearithmic algorithm, and turn this into good question (according to the standards of this site)?
Jul
27
revised Find the pair of values $a[i]$, $a[j]$ such that $a[i]\,\&\,a[j]$ is maximum
edited tags
Jul
27
comment Find the pair of values $a[i]$, $a[j]$ such that $a[i]\,\&\,a[j]$ is maximum
$a[i] \& a[j]$ is bitwise AND of $a[i]$ and $a[j]$? Where did you come across this problem? What is wrong with the trivial $\Theta(n^2)$ brute force algorithm? Is this a puzzle you are posing here?
Jul
26
revised Finding whether a sum of numbers in a set generate another number
edited tags
Jul
26
revised finding mod of an expression with variables
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Jul
25
revised Proving something about the Game Nim
edited tags
Jul
25
comment Asymptotic Behaviour Of A Bizarre Function 2
Related: math.stackexchange.com/questions/115824/…
Jul
25
comment Asymptotic Behaviour Of A Bizarre Function 2
@900sit-upsaday: Thanks! Wasn't aware of this nice feature. Been away from stackexchange long enough...
Jul
24
comment How prove this $\sum_{cyc}\frac{x+y-2z}{(x+y)^2+z^2}=0$
Why is this tagged inequality?
Jul
24
comment Polynomial representation
@Minu: Yes, that is correct.
Jul
24
comment Polynomial representation
@Mathmo123: Don't know. Let's see Minu's response. (You might be right though)
Jul
24
answered Polynomial representation
Jul
24
revised Showing that if $p$ is prime, then $(p^4 + 4)$ can't be prime
edited tags
Jul
24
comment Prove that an expression is zero for all sets of distinct $a_1, \dotsc, a_n\in\mathbb{C}$
@DamianPavlyshyn: Yes, or more simply, replace $a_1$ by $z$, do some algebra to get a polynomial in $z$ which has infinite roots (any $z \ne a_i$), allowing setting $z=0$.