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 Jan26 comment Can you be 1/12th Cherokee? @Keavon: Technically, the protagonist of that song is his own step-grandfather, not his own biological grandfather. Dec30 answered What would be the center of the curvature? Dec30 comment Why rationalize the denominator? @Ooker: Note the "floor" brackets. Dec9 awarded Caucus Oct22 awarded Nice Answer Sep12 answered Trignometric problem (using De Movier's Theorem) Sep12 comment In plain language, what's the significance of a field? @Hal: Not always. Another thing that would keep a field from having less/greater than is the numbers being conceived of two-dimensionally. Think of $\mathbb{C}$. Sep10 awarded Good Question Aug21 awarded Yearling Jul25 comment inverse trigonometric equation $\displaystyle \tan^{-1}{x}+\cot^{-1}{x}=\frac{\pi}{2}$ Hint: $\cot x = \tan(\frac{\pi}{2} - x)$. Jul16 comment Are all existence proofs by contradiction? Jul8 comment Calculate $\sum_{k=1}^n \frac 1 {(k+1)(k+2)}$ @Elimination beat you to it by 22 seconds. Jul4 comment How to distinguish walking on a sphere or on a torus? @dotancohen: Even if they could look up, people living on the outer parts of Planet Doughnut wouldn't have a view of the hole. Apr22 answered How many days are there in 70 years? Apr20 comment Kid's homework: 4 equations 5 unknowns? Going crazy! @metacompactness: Not necessarily. For example, there could be half-siblings on this trip, with 1 father and 2 mothers. Or cases where one parent is unable to attend. Apr5 answered how to find the root in $x^3-x^2+6x+24$? Apr5 comment Derivatives of exponential functions There's no $x$ in your function. Did you mean dt instead of dx? Apr5 answered Is $e^{-x}$ Lipschitz on the positive reals? Apr5 comment How can a piece of A4 paper be folded in exactly three equal parts? It would be interesting to see an answer that relies on the $\sqrt{2}:1$ ratio of ISO paper sizes. Mar29 comment Why is there a different button for 'minus' and 'negative' on a calculator? @Rahul: Based on your comment, I assume that you have an RPN calculator. However, I've also seen distinct - and ⁻ buttons on infix-notation calculators like the TI-8x series, on which there's no obvious need to distinguish them.