User Esteban Crespi - Mathematics Stack Exchange

bio	website
	location	Madrid, Spain
	age	49
visits	member for	2 years, 6 months
	seen	13 hours ago
stats	profile views	146

	1,451 reputation	bio	website		visits	member for	2 years, 6 months
59 badges		location	Madrid, Spain		seen	13 hours ago

102

176

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23

answers

7

kviews

Examples of apparent patterns that eventually fail

big-list examples-counterexamples

apr 10 at 3:04 Douglas B. Staple 1,014

85

156

votes

6

answers

4

kviews

“The Egg:” Bizarre behavior of the roots of a family of polynomials.

feb 27 at 20:28 Bruno 6,971

30

70

votes

3

answers

3

kviews

What is the smallest number of $45^\circ-60^\circ-75^\circ$ triangles that a square can be divided into?

geometry puzzle recreational-mathematics open-problem tiling

mar 25 at 15:26 Ed Pegg 2,081

28

69

votes

5

answers

3

kviews

Cutting sticks puzzle

combinatorics puzzle

sep 30 '11 at 14:21 Gerard 174

43

69

votes

18

answers

2

kviews

Good Physical Demonstrations of Abstract Mathematics

soft-question big-list physics education teaching

sep 20 at 17:04 Bob Terrell 698

40

67

votes

5

answers

3

kviews

In (relatively) simple words: What is an inverse limit?

category-theory intuition universal-algebra

mar 29 at 8:55 Pieter Cuijpers 31

16

49

votes

5

answers

1

kviews

Defining a manifold without reference to the reals

general-topology reference-request manifolds

jan 31 '12 at 2:24 Srivatsan 15.6k

38

44

votes

19

answers

14

kviews

Software for drawing geometry diagrams

geometry big-list math-software

may 1 at 9:49 Cruz 1

49

32

votes

8

answers

6

kviews

Teaching myself differential topology and differential geometry

reference-request differential-geometry differential-topology

feb 22 at 18:27 0x90 281

12

32

votes

1

answer

993

views

Decomposing polynomials with integer coefficients

elementary-number-theory polynomials diophantine-equations

jul 25 at 19:23 RicardoCruz 555

10

29

votes

1

answer

831

views

What is the expected number of steps in the following process?

probability

mar 16 '11 at 13:03 Holowitz 1

13

29

votes

1

answer

1

kviews

$n!$ is never a perfect square if $n\geq2$. Is there a proof of this that doesn't use Chebyshev's theorem?

number-theory factorial alternative-proof

jan 31 '12 at 20:46 Srivatsan 15.6k

29

26

votes

10

answers

1

kviews

Online resources for learning Mathematics

reference-request online-resources

may 3 at 19:31 Michelle Chen 1

8

24

votes

10

answers

1

kviews

Contributions of Galois Theory to Mathematics

abstract-algebra soft-question galois-theory

nov 18 at 15:52 Rahman 341

22

23

votes

4

answers

1

kviews

Understanding the intuition behind math

intuition math-history

feb 27 '11 at 6:40 Vicfred 726

7

23

votes

1

answer

826

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A prime number pattern

number-theory prime-numbers proof-strategy

aug 8 at 0:55 alex.jordan 8,804

10

21

votes

3

answers

904

views

Guaranteed Checkmate with Rooks in High-Dimensional Chess

combinatorics geometry puzzle recreational-mathematics combinatorial-game-theory

nov 13 at 20:14 Community♦ 1

10

21

votes

1

answer

717

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Relation between the Dedekind Zeta Function and Quadratic Reciprocity

number-theory algebraic-number-theory

apr 25 '11 at 7:52 Adrián Barquero 6,717

14

21

votes

3

answers

360

views

Intuition for the Importance of Modular Forms

number-theory intuition modular-forms

apr 10 at 7:23 Rohit Chatterjee 1

12

19

votes

1

answer

649

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Are Primes a Self-Fulfilling Prophecy?

number-theory prime-numbers algebraic-number-theory riemann-zeta

mar 14 '12 at 20:38 draks ... 6,328

5

15

votes

2

answers

716

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Not lifting your pen on the $n\times n$ grid

combinatorics graph-theory

feb 26 '11 at 23:23 Eric 33.3k

2

9

votes

2

answers

209

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Primes ending in 7

number-theory

mar 1 '12 at 4:38 Matt E 58k

3

9

votes

3

answers

217

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Half the rationals?

real-analysis elementary-number-theory rational-numbers

nov 3 at 19:14 Esteban Crespi 1,451

Esteban Crespi

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