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 Dec19 awarded Constituent Dec15 awarded Caucus Dec6 comment Prove by induction that $5^n - 1$ is divisible by $4$. Nice, clear, clean... a good answer indeed! Sep19 comment A function that creates a partition of values such that the sum is 1 Thank you!!! Do you know is this function has some special name (other than geometric series)? (I know I found it in a book some years ago, but I can't remember the name... or the book) Sep19 awarded Scholar Sep19 accepted A function that creates a partition of values such that the sum is 1 Sep19 revised A function that creates a partition of values such that the sum is 1 added 50 characters in body Sep19 comment A function that creates a partition of values such that the sum is 1 duh, right! Forgot to write that $k$ is a (deterministic) parameter of the function Sep19 comment A function that creates a partition of values such that the sum is 1 $k$ is a real number in the interval $(0,1)$ Sep19 revised A function that creates a partition of values such that the sum is 1 added 94 characters in body Sep19 awarded Student Sep19 comment A function that creates a partition of values such that the sum is 1 @Donkey_2009 No, I mean exactly the natural numbers... I'm editing the question to make it more clear Sep19 asked A function that creates a partition of values such that the sum is 1 Sep17 comment How can one prove that $e<\pi$? Fast, simple, elegant... Love it! Aug27 comment math fallacy problem: $-1= (-1)^3 = (-1)^{6/2} = \sqrt{(-1)^6}= 1$? I think that it should be noted that $\sqrt{a^2} = | a |$. So, when you calculate $\sqrt{(-1)^6}$ you are doing something like this: $\sqrt{(-1)^6}=((-1)^2)^\frac{3}{2}=\left(\sqrt{(-1)^2}\right)^3=(|-1|)^3=1$ May13 awarded Caucus Apr10 comment How can I prove that $xy\leq x^2+y^2$? Quite an elegant hint! Oct23 answered How to round 0.4999… ? Is it 0 or 1? Oct3 awarded Commentator Oct3 comment How do you find the center of a circle with a pencil and a book? This solution is far better than the accepted one, since it does not depends on perception ("put the corner of the book..." how do you know that you are really drawing a diameter?). +1 for this answer!