User Alistair

20 votes

Examples where it is easier to prove more than less

answered Nov 16, 2014 at 9:54

13 votes

Does a triangle always have a point where each side subtends equal 120° angles?

answered Dec 3, 2014 at 5:08

4 votes

Russia (2000) contest:Prove the existence of a pair of rows and columns with intersections differently coloured

answered Apr 10, 2016 at 11:25

3 votes

Number of length-n paths in a graph with a fixed start vertex

answered Nov 28, 2014 at 17:56

3 votes

Accepted

Greatest number equals sum of remaining numbers

answered Nov 5, 2014 at 0:02

2 votes

Game with $N$ players in a circle

answered Nov 7, 2014 at 2:11

2 votes

Accepted

Finding all the values of $\theta$ for which $\tan(\theta)=\sqrt3$; problem with understanding.

answered Nov 17, 2014 at 22:13

2 votes

Finding an angle between side and a segment from specified point inside an equilateral triangle

answered Nov 20, 2014 at 18:23

2 votes

Probability of selecting three of the same thing from a collection

answered Nov 17, 2014 at 20:20

2 votes

values of a $\displaystyle\lim_{x \to -\infty} x^a$

answered Aug 6, 2014 at 21:05

2 votes

Countrymen seated around a round table probability question

answered Nov 29, 2014 at 4:26

2 votes

Get the numbers from (0-30) by using the number $2$ four times

answered Nov 22, 2014 at 21:01

2 votes

Two questions on number 2013

answered Nov 26, 2014 at 16:26

2 votes

Congruence - Number Theory

answered Apr 18, 2016 at 21:46

2 votes

Is it possible to prove a quadrilateral a parallelogram with two consecutive and two opposite congruent sides?

answered Feb 18, 2016 at 15:48

1 vote

Probability of attending cinema and theater.

answered Nov 17, 2014 at 15:40

1 vote

Accepted

Number of ways of getting from a certain point to another point.

answered Mar 21, 2016 at 0:53

1 vote

find image and inverse image of function

answered Nov 26, 2014 at 18:44

1 vote

How to prove/disprove proof on limits (delta-epsilon)

answered Nov 27, 2014 at 5:57

1 vote

making a metric space for special open ball

answered Nov 14, 2014 at 7:56

1 vote

Determining the position of a perpendicular line segment connecting two parallel lines that is equidistant from 2 points

answered Feb 11, 2016 at 7:42

1 vote

Show that among all quadrilaterals of a given perimeter the square has the largest area

answered Feb 14, 2016 at 8:19

1 vote

Find the number of all 3 digit numbers $n$ such that $S(S(n))=2$

answered Dec 8, 2014 at 11:40

1 vote

General term of the series - find

answered Feb 19, 2015 at 19:49

1 vote

Lambert's Original Proof that $\pi$ is irrational.

answered Aug 12, 2014 at 22:36

1 vote

Accepted

Is there a 10-digit emirp?

answered Aug 13, 2014 at 17:13

1 vote

Minimum number of attempts to guess a PIN code, given constraints

answered Aug 15, 2014 at 3:10

1 vote

Finding an angle between the side of a triangle and a segment from a point inside the triangle.

answered Oct 28, 2014 at 22:13

1 vote

Accepted

Counting principles and probability question

answered Oct 13, 2014 at 22:30

1 vote

Solve $\lim_{n\to\infty}\frac{1}{{2n+1}}\sqrt{(25-a^2)n^2+2n+3}=2$ for $a$

answered Nov 19, 2014 at 16:13

Stack Exchange Network

43 Answers

Examples where it is easier to prove more than less

Does a triangle always have a point where each side subtends equal 120° angles?

Russia (2000) contest:Prove the existence of a pair of rows and columns with intersections differently coloured

Number of length-n paths in a graph with a fixed start vertex

Greatest number equals sum of remaining numbers

Game with $N$ players in a circle

Finding all the values of $\theta$ for which $\tan(\theta)=\sqrt3$; problem with understanding.

Finding an angle between side and a segment from specified point inside an equilateral triangle

Probability of selecting three of the same thing from a collection

values of a $\displaystyle\lim_{x \to -\infty} x^a$

Countrymen seated around a round table probability question

Get the numbers from (0-30) by using the number $2$ four times

Two questions on number 2013

Congruence - Number Theory

Is it possible to prove a quadrilateral a parallelogram with two consecutive and two opposite congruent sides?

Probability of attending cinema and theater.

Number of ways of getting from a certain point to another point.

find image and inverse image of function

How to prove/disprove proof on limits (delta-epsilon)

making a metric space for special open ball

Determining the position of a perpendicular line segment connecting two parallel lines that is equidistant from 2 points

Show that among all quadrilaterals of a given perimeter the square has the largest area

Find the number of all 3 digit numbers $n$ such that $S(S(n))=2$

General term of the series - find

Lambert's Original Proof that $\pi$ is irrational.

Is there a 10-digit emirp?

Minimum number of attempts to guess a PIN code, given constraints

Finding an angle between the side of a triangle and a segment from a point inside the triangle.

Counting principles and probability question

Solve $\lim_{n\to\infty}\frac{1}{{2n+1}}\sqrt{(25-a^2)n^2+2n+3}=2$ for $a$