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 May 10 answered Find a number $b$ such that $a\cdot b\equiv 1\mod m$ May 9 answered Your favourite maths puzzles May 9 comment Your favourite maths puzzles I think this problem is a bit too well-known. en.wikipedia.org/wiki/Fair_coin#Fair_results_from_a_biased_coin May 8 awarded Enlightened May 8 awarded Nice Answer May 8 comment Where did the word “logarithm” come from? @Qiaochu: Note that I was requiring that the word be accepted as "elevated" to lowercase usage in order to sufficiently divorce it from its origin as a proper noun. Both "algorithm" and (often) "abelian" enjoy this status. May 8 accepted Need a result of Euler that is simple enough for a child to understand May 8 revised Where did the word “logarithm” come from? added historical note May 8 answered Where did the word “logarithm” come from? May 7 answered Can this number theory MCQ be solved in 4 minutes? May 7 comment Factorize $x^3-3x+2$ @cardano: since Jim didn't answer, I will: often you can notice small roots just from examination. For example, any polynomial with no constant term will have 0 as a root. If the sum of the coefficients sum to zero (as they do in your question) then 1 is a root. It's usually worth trying -1 as well. Most "real" polynomials won't have nice roots like this, but contrived homework problems and textbook problems will. May 6 comment Infinity = -1 paradox A similarly wrong (but simpler) proof would go like this: $\infty+1$ is still $\infty$ since you can't make it any larger. But then we have $\infty = \infty+1$ and we subtract infinity from both sides proving $0=1$. May 6 awarded Nice Answer May 5 comment Factorize $x^3-3x+2$ I don't understand the animosity toward the asker here. What is wrong with asking how to factorize a polynomial? May 4 answered Recommended Math knowledge for programming May 3 comment Need a result of Euler that is simple enough for a child to understand @user9325: Only this [citation needed] wikipedia entry: en.wikipedia.org/wiki/Carl_Friedrich_Gauss#Family (The relevant portion of this entry is repeated hundreds of times in web searches, but none has a citation.) May 3 awarded Nice Question May 3 asked Need a result of Euler that is simple enough for a child to understand May 3 awarded Enthusiast May 2 awarded Self-Learner