# Ewan Delanoy

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35

## Connected metric spaces with disjoint open balls

May 25 '13 at 3:02

29

## Number of simple edge-disjoint paths needed to cover a planar graph

Jul 16 '14 at 7:02

30

Apr 8 at 22:59

14

## Alice and Bob matrix problem.

Oct 30 '12 at 18:52

21

9

## Inequality for expected value

Mar 19 '12 at 12:47

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16

## What is the sum of sum of digits of $4444^{4444^{4444}}$?

Dec 27 '15 at 19:04

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12

17

## Is this sequence unbounded?

Jan 20 '13 at 4:59

8

## Does $2x^2-1=y^5$ have a solution in integers, with $y>1$?

Feb 20 '12 at 15:33

28

## Mind maps of Advanced Mathematics and various branches thereof

Mar 9 '13 at 14:22

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23

## Square matrices satisfying certain relations must have dimension divisible by $3$

Feb 26 '13 at 10:26

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17

4

## When is a sum of consecutive squares equal to a square?

Nov 5 '15 at 23:08

10

## How did Ramanujan get this result?

Jun 20 '12 at 13:21

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7

15

## How prove this sum $\sum_{n=1}^{\infty}\binom{2n}{n}\frac{(-1)^{n-1}H_{n+1}}{4^n(n+1)}$

Jul 23 '14 at 3:25

10

## Finding the fraction $\frac{a^5+b^5+c^5+d^5}{a^6+b^6+c^6+d^6}$ when knowing the sums $a+b+c+d$ to $a^4+b^4+c^4+d^4$

May 28 '13 at 4:30

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7

## How many squares does a line between two points pass through?

Apr 2 '12 at 2:26

9