User Yaakov Baruch

83 votes

Examples of common false beliefs in mathematics

answered Mar 6, 2011 at 22:35

75 votes

What's your favorite equation, formula, identity or inequality?

answered Feb 8, 2010 at 14:14

18 votes

Accepted

Extending $\Bbb N$ to a semiring with isomorphic additive and multiplicative structure

answered Jul 16, 2017 at 22:23

16 votes

Why is the billiard problem for obtuse triangles so hard?

answered Oct 23, 2019 at 8:14

13 votes

Accepted

infinite configuration of lines

answered Jun 1, 2011 at 4:39

12 votes

Accepted

Associative mean

answered Nov 14, 2017 at 18:42

11 votes

A naive diophantine approximation question

answered Jul 5, 2017 at 20:03

10 votes

Are there Monohedra with odd numbers of faces?

answered Oct 16, 2021 at 21:40

10 votes

1 rectangle <= 4 squares

answered Feb 26, 2010 at 2:36

9 votes

Ideas on how to prevent a department from being shut down.

answered Apr 27, 2011 at 23:03

9 votes

Prime square offsets: Why is +7 more frequent than -7?

answered Apr 27, 2017 at 14:41

9 votes

Positive integers written as $\binom{w}2+\binom{x}4+\binom{y}6+\binom{z}8$ with $w,x,y,z\in\{2,3,\ldots\}$

answered Feb 27, 2019 at 21:01

8 votes

Fair cutting of the plane with lines

answered Mar 31, 2021 at 22:12

8 votes

Accepted

Polynomial whose values divide $n!$

answered Jul 13, 2021 at 13:15

8 votes

Accepted

Can $[0,1]^4$ be partitioned into copies of $(0,1)^3$?

answered Aug 27, 2021 at 7:46

8 votes

Accepted

How to deduce an equation from this 3 Diophantine equations with 5 variables?

answered Aug 3, 2017 at 7:05

7 votes

If $x_{n+1}= \frac{nx_{n}^2+1}{n+1}$ then $x_{n}=1$

answered Aug 13, 2017 at 13:14

7 votes

Accepted

Can the thief escape (from a smooth, simple closed curve)?

answered Oct 7, 2021 at 22:32

6 votes

Accepted

Tilting the $d$-cube to vertically separate its vertices

answered Feb 13, 2021 at 23:17

6 votes

Accepted

Product of arithmetic progressions

answered Oct 16, 2018 at 21:06

5 votes

This inequality why can't solve it by now (Only four variables inequality)?

answered Jan 13, 2015 at 8:21

5 votes

Blocking visibility with cylinders

answered May 10, 2011 at 12:54

5 votes

Is $\lceil \frac{n}{\sqrt{3}} \rceil > \frac{n^2}{\sqrt{3n^2-5}}$ for all $n > 1$?

answered Nov 6, 2014 at 23:14

5 votes

What is your favorite "strange" function?

answered Apr 23, 2010 at 8:38

5 votes

Is there a nonzero solution to this infinite system of congruences?

answered Jan 13, 2021 at 7:40

5 votes

Accepted

Convex lattice polygons with equal area and perimeter

answered Mar 14, 2021 at 5:13

4 votes

Why do we make such big deal about the 'unsolvability' of the quintic?

answered Feb 23, 2023 at 16:27

4 votes

1 rectangle <= 4 squares

answered Mar 2, 2010 at 20:18

4 votes

Is it possible to capture a sphere in a knot?

answered Dec 8, 2009 at 1:53

4 votes

Which irrationals yield bounded sets of iterates?

answered May 11, 2015 at 20:43

Stack Exchange Network

56 Answers

Examples of common false beliefs in mathematics

What's your favorite equation, formula, identity or inequality?

Extending $\Bbb N$ to a semiring with isomorphic additive and multiplicative structure

Why is the billiard problem for obtuse triangles so hard?

infinite configuration of lines

Associative mean

A naive diophantine approximation question

Are there Monohedra with odd numbers of faces?

1 rectangle <= 4 squares

Ideas on how to prevent a department from being shut down.

Prime square offsets: Why is +7 more frequent than -7?

Positive integers written as $\binom{w}2+\binom{x}4+\binom{y}6+\binom{z}8$ with $w,x,y,z\in\{2,3,\ldots\}$

Fair cutting of the plane with lines

Polynomial whose values divide $n!$

Can $[0,1]^4$ be partitioned into copies of $(0,1)^3$?

How to deduce an equation from this 3 Diophantine equations with 5 variables?

If $x_{n+1}= \frac{nx_{n}^2+1}{n+1}$ then $x_{n}=1$

Can the thief escape (from a smooth, simple closed curve)?

Tilting the $d$-cube to vertically separate its vertices

Product of arithmetic progressions

This inequality why can't solve it by now (Only four variables inequality)?

Blocking visibility with cylinders

Is $\lceil \frac{n}{\sqrt{3}} \rceil > \frac{n^2}{\sqrt{3n^2-5}}$ for all $n > 1$?

What is your favorite "strange" function?

Is there a nonzero solution to this infinite system of congruences?

Convex lattice polygons with equal area and perimeter

Why do we make such big deal about the 'unsolvability' of the quintic?

1 rectangle <= 4 squares

Is it possible to capture a sphere in a knot?

Which irrationals yield bounded sets of iterates?