User Ewan Delanoy - Mathematics Stack Exchange

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	8,413 reputation	bio	website		visits	member for	1 year, 8 months
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1

21

votes

1

answer

181

views

Smallest order for finite group that needs many elements to generate it

group-theory finite-groups

nov 2 '11 at 13:57 Brian M. Scott 155k

2

13

votes

2

answers

301

views

Comparing countable models of ZFC

jul 6 at 14:07 JDH 18.5k

4

11

votes

2

answers

525

views

Set of zeroes of the derivative of a pathological function

calculus examples-counterexamples

jun 8 '12 at 16:03 Ewan Delanoy 8,413

8

votes

1

answer

83

views

Do best lower approximations of a quadratic irrational always form a linear recurrence sequence?

linear-algebra real-analysis continued-fractions diophantine-approximation

mar 7 '12 at 17:23 Ewan Delanoy 8,413

2

7

votes

2

answers

121

views

Explicit Galois theory computation in cyclotomic field

field-theory galois-theory cyclotomic-polynomial

feb 18 at 10:56 Willie Wong♦ 30.7k

1

7

votes

0

answers

111

views

Extracting an (almost) independent large subset from a pairwise independent set of Bernoulli variables

probability combinatorics

jan 25 at 12:51 Ewan Delanoy 8,413

7

votes

1

answer

95

views

“Real part” of a number field

polynomials field-theory algebraic-number-theory

nov 18 at 19:54 mercio 11.3k

1

7

votes

5

answers

341

views

Partition of the plane into union of open segments

geometry general-topology examples-counterexamples

jun 14 '12 at 7:24 Robert Israel 86.4k

1

7

votes

3

answers

383

views

Show that this polynomial is positive

real-analysis polynomials

apr 29 '12 at 10:33 Lierre 2,882

2

7

votes

0

answers

139

views

What is the dimension of this algebraic variety?

algebraic-geometry polynomials

nov 11 '11 at 12:09 Ewan Delanoy 8,413

3

6

votes

1

answer

62

views

Orthogonality between three vectors whose coordinates are nondecreasing

real-analysis euclidean-geometry

mar 7 at 20:29 Ewan Delanoy 8,413

2

6

votes

0

answers

138

views

Multivariate polynomial with all coefficients positive

inequality symmetric-polynomials

feb 5 at 5:11 Ewan Delanoy 8,413

3

6

votes

4

answers

185

views

Number fields with all degrees equal to a power of three

field-theory

jan 27 at 20:22 Ewan Delanoy 8,413

2

6

votes

1

answer

114

views

Solving a polynomial equation with a parametrization

algebraic-geometry polynomials

dec 7 at 15:18 mercio 11.3k

2

6

votes

2

answers

202

views

Products of copies of $\mathbb Z$ that are not semi-direct

abstract-algebra group-theory

dec 2 at 3:42 Ewan Delanoy 8,413

2

6

votes

3

answers

300

views

Image of determinant on symplectic/orthogonal matrix group

linear-algebra group-theory matrices

sep 30 at 15:08 Marc van Leeuwen 23.9k

6

votes

3

answers

227

views

Is the set of all deducible formulas decidable?

logic computability

sep 5 '11 at 7:57 Kaveh 1,929

5

votes

2

answers

66

views

Half-symmetric, homogeneous inequality

inequality polynomials

apr 9 at 6:07 Potla 76

5

votes

2

answers

138

views

Closure of a number field with respect to roots of a cubic

polynomials field-theory

jan 25 at 21:10 Hurkyl 21.5k

5

votes

2

answers

125

views

In an ideal, pairwise non-coprime implies globally non-coprime?

commutative-algebra polynomials ideals

nov 26 at 4:38 Ewan Delanoy 8,413

5

votes

3

answers

126

views

Always a value with uncountably many preimages? (for a continuous real map on the plane)

real-analysis set-theory

jun 22 '12 at 12:31 Byron Schmuland 15.4k

1

5

votes

1

answer

232

views

Can forcing push the continuum above a weakly inacessible cardinal?

set-theory large-cardinals forcing

oct 27 '11 at 18:59 Steven Stadnicki 14.2k

5

votes

1

answer

70

views

Independent statements that cannot be weakened

logic

oct 2 '11 at 12:53 Carl Mummert 25.7k

5

votes

1

answer

352

views

Are there statements that are undecidable but not provably undecidable

logic set-theory

sep 17 '11 at 20:03 Henning Makholm 53.6k

4

votes

1

answer

54

views

Special undecidability situation

logic incompleteness

may 12 at 17:27 Carl Mummert 25.7k

1

4

votes

2

answers

116

views

Version of Jordan’s theorem for unbounded curves

geometry general-topology

dec 12 at 12:26 Ewan Delanoy 8,413

4

votes

2

answers

88

views

Relation between inacessible cardinals and CH

set-theory large-cardinals

oct 14 at 18:35 Asaf Karagila 91.3k

4

votes

1

answer

117

views

Comparing a Riemann sum to its limit

calculus integration

jun 8 '12 at 2:31 Did 103k

1

4

votes

1

answer

252

views

Maximize the integral of $f$, knowing the integral of $\frac{1}{f}$, for a Lipschitz function $f$

calculus functional-analysis optimization integration

may 8 '12 at 0:50 Robert Israel 86.4k

1

4

votes

1

answer

113

views

A simple-looking diophantine equation

number-theory polynomials diophantine-equations

feb 25 '12 at 12:02 miracle173 840

Ewan Delanoy

108 Questions