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7h
comment To solve $n(n+1)(n+2)=6m^3$ in positive integers $m,n$
Very nice! I was half-way there myself, but I didn't know that result of Bennett's.
8h
comment Prove that $f'(c ) = 0$
This is the Alternative Intermediate Value Theorem: If $a\le x\le b$, and $a=b$, then $x=a$. Furthermore, $x=b$.
8h
comment Mixed Strategy Nash Equilibrium of Rock Paper Scissors with 3 players?
With these payoff matrices, two players can clean out the third player simply by arranging to always play differently from each other. The third player will break even one-third of the time,lose $1$ one-third of the time, and gain $0.5$ one-third of the time.
10h
comment Write all elements of A.A = {$x|x^2<x<10$,x is a whole number}. Answer: A ={$x|x^2+1=0$}.Explain like i'm five.
@molarmass: I suspect it was a multiple-choice question: Which of these sets is equal to $A$?
14h
answered Probability of two strings being equal
1d
comment After switching a lamp on and off infinitely many times in one minute, is it on or off?
An excellent answer.
1d
comment Finding the remainder while dividing negative numbers?
It's "remainder", Ofir. "Reminder" means "Erinnerung".
1d
revised Determine the locus of a equation Quickly[Mental Math]
added 359 characters in body
1d
answered Determine the locus of a equation Quickly[Mental Math]
2d
answered Storing a natural number as a set of it's nth prime factors, how much data is used?
Jun
28
comment Prove sum of $\sin$ of angles is greater than $\sin$ of sum of angles
And what is the purpose of dividing each $x_i$ by $2$? It just clutters things up. Can you tidy up your question, please? No $2r$, and no dividing by $2$.
Jun
28
answered Find the limit of $A={\{(\dfrac{\theta-1}{\theta}}, \theta)|\theta=1,2,3,\dots\}$
Jun
28
revised Find the limit of $A={\{(\dfrac{\theta-1}{\theta}}, \theta)|\theta=1,2,3,\dots\}$
Restored mention of polar coordinates (at the risk of setting a record for most-edited post)
Jun
28
comment Among $k$ consecutive numbers one has sum of digits divisible by $11$
Oh yes, so it does. I will leave my comment up, in case anybody else makes the same mistake as me.
Jun
28
comment Among $k$ consecutive numbers one has sum of digits divisible by $11$
Why isn't that $20+28$? There are $28$ non-zero digit sums at the start of the first table. And the first table follows the fourth table in the range $[5599999999981,5600000000028]$.
Jun
28
comment find a method for twin primes and with Golbach conjecture
Twin primes and Goldbach! This is truly a special day.
Jun
28
answered Find the sum of the first $3n$ terms of a geometric series given the sum of the first $n$ terms is $48$ and the sum of first $2n$ terms is $60$
Jun
26
comment What does “bounded away from zero” actually mean?
@Lubin: What are you talking about? Is that Emily Dickinson? Anyway, the expression belongs to the written language of mathematics $-$ we didn't go around saying things like "the number of beers I've drunk is bounded away from zero". Honestly we didn't. So you can ungrit your teeth. And google "bounded away from zero" if you like.
Jun
26
comment What does “bounded away from zero” actually mean?
@Lubin: I would not say that the author is to blame here: "bounded away from zero" is a common enough expression, with a well-defined meaning. At least it was in my day.
Jun
26
comment What does “bounded away from zero” actually mean?
@MichaelBurr: That is not strictly true. If $f(x) = 0$ for some value of $x$, then $f$ is not bounded away from zero; but zero is not necessarily an accumulation point of $f$. Take for instance the sign function sgn$(x)$.