Tag: puzzle

110 Math puzzles for dinner 2010-06-24T04:36:51.480

59 Identifying poisoned wines 2011-03-29T04:18:43.900

48 cube + cube + cube = cube 2011-01-24T12:07:20.103

45 Puzzle on deleting k bits from binary vectors of length 3k 2013-09-22T07:10:04.767

31 "The Two Sheriffs" puzzle 2015-04-17T12:13:24.630

31 A puzzle with some jumping frogs 2017-03-25T11:22:34.163

26 The ants-on-a-ball problem 2009-10-24T21:40:02.833

25 What is this subgroup of $\mathfrak S_{12}$? 2010-11-12T16:30:56.990

25 A Presentation for Rubik's cube group? 2011-08-09T10:01:08.697

24 A puzzle about finding three points $(x,y)$, $(x,z)$ and $(y,z)$ in a subset of a square. 2011-02-25T11:25:42.950

24 An Interesting Optimization Problem 2014-03-19T09:58:22.367

23 Integers in a triangle, and differences 2010-12-01T14:02:51.043

22 An elementary problem in Euclidean geometry 2011-04-26T16:07:32.947

21 What are the automorphism groups of (principally polarized) abelian varieties? 2009-11-01T23:28:52.300

21 How to get rich in a Hilberts Hotel? 2012-02-12T16:59:55.033

21 Covering of a surface of a cube $n\times n \times n$ by pieces of paper $1\times 6$ 2015-10-23T21:54:03.787

19 Perpetuum Mobile 2010-01-06T03:41:55.413

19 How many unit squares can you pack into a rectangle with nearly integer side lengths? 2010-03-27T05:34:05.297

19 A balls-and-colours problem 2010-10-12T19:53:08.483

17 Turning pants inside-out (or backwards) while tied together 2010-04-18T23:39:55.583

17 a game on sets of reals 2013-07-22T03:58:53.613

16 A riddle about zeros, ones and minus-ones 2009-12-01T20:00:07.423

16 Irreversible chess 2011-10-22T12:59:06.600

12 Generalization of the two bucket puzzle 2009-11-17T07:58:03.507

12 God's number for the $n \times n \times n$-cube 2011-10-11T16:24:39.777

11 A fun game related to knot theory 2015-08-10T16:58:58.650

10 Hard Cube Puzzle 2011-01-19T18:43:18.313

10 Guessing a subset of {1,...,N} 2011-03-16T02:54:33.690

10 Can an infinite number of mathematicians guess the number in a box with only one error? 2013-12-25T08:32:10.067

10 Could a perfect squared square be split into two perfect squared squares? 2014-03-21T16:15:01.340

9 Minimize Perimeter(S)/Area(S) for S inside the unit square. 2009-11-11T06:15:47.853

9 Is this a sleight of hand or a video edit? 2009-12-28T13:42:33.583

9 100 Prisoners, 100 Boxes: Proof of Optimality 2010-07-12T04:05:19.907

9 How many ways to partition a group of people? 2014-03-19T01:07:02.610

9 Undecidable puzzles 2014-08-04T15:59:05.493

8 Generalization of Finch Cheney's 5 Card Trick 2010-04-07T21:43:25.357

8 Sticks and thread 2010-06-26T08:40:14.003

8 Generalization of a horse-racing puzzle 2010-12-30T16:48:54.653

8 Knight tour prime (conjecture) 2012-05-08T18:44:42.740

8 Another colored balls puzzle (part II) 2013-05-13T19:09:56.753

7 12 balls weighing puzzle 2010-09-17T23:13:19.407

7 Probability of a black path on a random chess board 2011-08-17T12:45:35.560

7 Labeling a Square Array 2012-02-13T13:31:25.747

7 A function that is defined everywhere but has unknown values 2012-09-14T11:13:54.167

7 Blue and red balls puzzle 2013-05-16T15:48:09.137

6 Moshe Rosenfeld's Salmon Problem 2010-01-20T20:56:00.207

6 Reconstruction puzzles 2010-01-21T09:41:08.280

6 Does there exist a holomorphic function which takes given values on the positive integers? 2010-04-08T12:06:17.683

6 function that sums to zero over cube vertices 2010-11-27T01:00:33.540

6 Point in Polygon algorithm from the viewpoint of a robot 2010-12-24T17:11:15.563

6 Circumference of Convex Shapes 2011-07-28T15:46:46.013

5 What is the probability that 4 points determine a hemisphere ? 2010-01-07T16:41:52.307

5 probability and math puzzle books/references 2011-04-23T09:35:37.963

5 Bike lock puzzle 2012-08-02T20:27:56.550

5 A simple language and systematic computations 2013-09-30T19:26:44.027

5 Infinite blue eyed islanders puzzle 2014-01-02T01:04:01.577

5 coin reversal puzzle with one hand and two stacks 2014-04-09T01:15:47.463

5 What is God's number for the WrapSlide puzzle? 2014-10-22T14:35:51.763

4 Origin of Fujimura set 2010-01-31T21:08:52.483

4 Ulam spiral coordinate system 2010-06-22T03:47:35.017

4 Dissecting using a ruler and compass 2013-11-25T17:23:37.920

4 Separating Heavier from the Lighter Balls 2016-05-06T16:27:25.457

4 How many inclusion preserving maps of subsets? 2017-02-14T15:33:22.643

3 Dance battles and de Bruijn sequences 2009-10-19T12:03:22.687

3 Shortest Key for the Monte Carlo Lock of Smullyan 2010-02-03T13:57:14.073

3 Is always possible to slice a pizza in a fair way 2010-10-06T15:45:51.430

3 The Mystic Rose 2010-12-30T17:03:34.560

3 two boy scouts problems 2013-05-14T12:00:13.577

3 Simple reason that a mathematician cannot do better than random when guessing contents of a box? 2014-01-02T00:38:34.160

3 All Integers from the Smallest Digit Stream with a Window Filter 2014-04-29T16:30:57.350

3 Generalized Shared Birthday 2016-12-31T07:42:18.363

3 Find four sets of coins with similar weights 2017-08-24T22:33:19.417

2 Limit shape for oil-shaped stack in the max overhang problem 2015-02-03T03:19:05.243

2 How many different solutions does this cube puzzle have? 2016-07-17T08:36:22.113

1 Ants on a rod puzzle 2010-03-15T17:36:19.273

1 Honest and Deceitful Professors Problem 2011-07-06T06:15:07.787

1 Concrete solution to the (oriented) Oberwolfach problem with one table 2015-12-07T09:13:19.683

1 Fill the board with zeroes, inverting the intersections of rows and columns 2018-02-02T10:26:20.767

0 How to attack this diophantine equation in 3 variables? 2009-10-11T23:35:45.140

0 How to tackle this puzzle? 2010-08-24T13:50:34.070

0 Gödel, Escher, Bach: b is a power of 10. 2013-03-01T03:08:59.367

0 Minimize the length of two disjoint segments in the string with given property 2014-03-19T10:15:29.127