## Mathematics Stack Exchange by Kiwix

Q&A for people studying math at any level and professionals in related fields

### Most popular questions

1091 Visually stunning math concepts which are easy to explain 2014-03-31T11:44:18.473

929 Can I use my powers for good? 2011-10-12T02:53:45.587

920 How long will it take Marie to saw another board into 3 pieces? 2013-05-03T03:31:47.187

907 Is $\frac{\textrm{d}y}{\textrm{d}x}$ not a ratio? 2011-02-09T16:23:43.880

692 How to study math to really understand it and have a healthy lifestyle with free time? 2011-06-11T04:26:58.243

660 The staircase paradox, or why $\pi\ne4$ 2010-12-03T13:44:56.300

639 Different methods to compute $\sum\limits_{k=1}^\infty \frac{1}{k^2}$ (Basel problem) 2010-10-30T10:04:43.110

627 A short proof for $\dim(R[T])=\dim(R)+1$? 2013-04-11T15:19:32.610

618 Splitting a sandwich and not feeling deceived 2014-01-14T05:08:41.720

567 Does Pi contain all possible number combinations? 2012-10-18T14:35:20.977

565 What's an intuitive way to think about the determinant? 2010-07-25T02:25:11.593

526 Why can you turn clothing right-side-out? 2010-08-19T00:08:12.373

518 Why is $1 - \frac{1}{1 - \frac{1}{1 - \ldots}}$ not real? 2016-03-03T20:46:58.663

503 Mathematical difference between white and black notes in a piano 2010-11-24T09:24:05.267

480 Examples of patterns that eventually fail 2012-02-20T21:40:19.373

469 Is this Batman equation for real? 2011-07-29T21:15:06.203

466 What are imaginary numbers? 2012-09-20T12:18:35.747

443 Do complex numbers really exist? 2010-07-20T22:17:36.010

418 "The Egg:" Bizarre behavior of the roots of a family of polynomials. 2012-10-04T00:55:50.433

412 My son's Sum of Some is beautiful! But what is the proof or explanation? 2013-05-29T20:50:20.770

381 How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$? 2011-10-23T16:21:03.310

380 Proofs that every mathematician should know. 2012-08-05T00:14:45.557

365 Why does $1+2+3+\cdots = -\frac{1}{12}$? 2011-05-18T04:26:29.813

359 On "familiarity" (or How to avoid "going down the Math Rabbit Hole"?) 2013-12-24T22:08:07.127

358 How can I evaluate $\sum_{n=0}^\infty(n+1)x^n$? 2011-04-03T21:41:22.313

341 Best Sets of Lecture Notes and Articles 2013-02-13T09:15:39.853

336 Pedagogy: How to cure students of the "law of universal linearity"? 2014-01-07T16:10:17.453

334 Fourier transform for dummies 2010-07-28T18:07:57.030

328 The Ring Game on $K[x,y,z]$ 2012-06-16T03:40:15.820

324 Find five positive integers whose reciprocals sum to $1$ 2013-01-30T09:31:18.037

314 What is the intuitive relationship between SVD and PCA? 2010-09-02T11:52:10.883

304 Zero to the zero power – is $0^0=1$? 2010-11-20T23:02:43.643

304 Can every proof by contradiction also be shown without contradiction? 2012-11-24T15:31:32.860

298 The length of toilet roll 2016-01-30T22:00:36.257

295 Why don't we define "imaginary" numbers for every "impossibility"? 2012-12-15T23:36:09.890

286 'Obvious' theorems that are actually false 2014-06-04T17:38:28.373

282 In Russian roulette, is it best to go first? 2012-01-04T12:38:34.503

282 Why does this innovative method of subtraction from a third grader always work? 2018-02-26T19:52:31.057

281 Multiple-choice question about the probability of a random answer to itself being correct 2011-10-27T22:20:28.437

274 Surprising identities / equations 2013-09-26T00:45:10.557

261 One question to know if the number is 1, 2 or 3 2013-10-03T09:18:36.163

260 Help with a prime number spiral which turns 90 degrees at each prime 2016-12-26T10:06:32.993

258 The Mathematics of Tetris 2011-11-08T16:51:44.797

258 Is '$10$' a magical number or I am missing something? 2012-07-05T05:39:19.417

258 Nice examples of groups which are not obviously groups 2013-04-15T15:02:03.593

255 How can you prove that a function has no closed form integral? 2010-07-20T22:17:38.477