User Ewan Delanoy - Mathematics Stack Exchange

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	8,178 reputation	bio	website		visits	member for	1 year, 8 months
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4

votes

2

answers

114

views

+100

Multiplication of determinants

linear-algebra determinant

may 15 at 12:00 Ewan Delanoy 8,178

5

votes

1

answer

130

views

+25

Grobner Basis and generating set

may 12 at 9:45 YACP 8,950

0

votes

1

answer

68

views

+50

Finding the error of the Taylor expansion of $\log(1 + x)$

calculus sequences-and-series summation taylor-expansion

may 10 at 11:33 TMM 7,156

4

11

votes

2

answers

298

views

+100

Prove $\sum_{i=1}^{n}\frac{a_{i}}{a_{i+1}}\ge\sum_{i=1}^{n}\frac{1-a_{i+1}}{1-a_{i}}$ if $a_{i}>0$ and $a_{1}+a_{2}+\cdots+a_{n}=1$

inequality

apr 19 at 17:26 Ewan Delanoy 8,178

3

votes

1

answer

88

views

+50

Riemann integrable proof

calculus analysis integration

apr 15 at 15:35 Ewan Delanoy 8,178

1

3

votes

1

answer

130

views

+50

Finding the dimensions of subspaces of a Vector space and S-cyclic subspaces using minimal poynomials

linear-algebra vector-spaces transformation

apr 1 at 13:28 julien 22.3k

5

16

votes

1

answer

303

views

+50

A Combinatorial Proof of Dixon's Identity

combinatorics reference-request binomial-coefficients

mar 30 at 14:04 Ewan Delanoy 8,178

3

votes

2

answers

111

views

+200

Coupon Collector's Problem

homework probability-theory random-variables

mar 28 at 3:32 Ewan Delanoy 8,178

4

votes

1

answer

109

views

+50

Prove by using diagonalization

homework linear-algebra matrices

mar 22 at 18:29 Ewan Delanoy 8,178

4

13

votes

2

answers

387

views

+500

Signed Multinomial Expansion Coefficients?

combinatorics polynomials

mar 26 at 9:09 Will Orrick 2,552

14

votes

3

answers

259

views

+150

Finding the degree of a field extension over the rationals

field-theory galois-theory

mar 13 at 18:12 Ewan Delanoy 8,178

1

9

votes

2

answers

221

views

+25

What can we say about $(I-AD)^{-1}$ if $D$ is a diagonal matrix?

linear-algebra matrices

feb 23 at 2:39 Kaster 3,008

1

5

votes

3

answers

238

views

+100

Showing that complicated mixed polynomial is always positive

calculus algebra-precalculus inequality

dec 24 at 6:03 fedja 2,892

5

votes

1

answer

172

views

+50

Prove Noether-Skolem theorem for $M_2(\mathbb{C})$ by calculation

linear-algebra abstract-algebra ring-theory

dec 17 at 10:21 Ewan Delanoy 8,178

5

8

votes

2

answers

305

views

+25

A difficult symmetric inequality

inequality

dec 27 at 8:48 ivan 878

3

votes

1

answer

168

views

+50

Minimising the maximum distance between bounded functions for a given bounded function

functional-analysis functions

dec 14 at 2:55 Ben Millwood 3,689

3

18

votes

4

answers

467

views

+50

Example of two dependent random variables that satisfy $E[f(X)f(Y)]=Ef(X)Ef(Y)$ for every $f$

probability statistics

nov 29 at 23:23 just 19

2

votes

1

answer

88

views

+200

Linear forms, “projections”, an inequality - French agregation

linear-algebra real-analysis

nov 28 at 12:58 Ewan Delanoy 8,178

2

5

votes

1

answer

147

views

+50

Almost all labeled graphs implies almost all graphs?

graph-theory asymptotics extremal-combinatorics algebraic-graph-theory

nov 15 at 10:29 Ewan Delanoy 8,178

2

4

votes

1

answer

139

views

+50

Isomorphism between centralizer and semi direct product

group-theory

nov 15 at 6:05 Ewan Delanoy 8,178

1

3

votes

5

answers

621

views

+25

Sequence of solutions to $x\sin x=1$

sequences-and-series trigonometry limit

dec 10 at 20:45 Qiaochu Yuan 117k

4

11

votes

2

answers

112

views

+50

Is a bivariate function that is a polynomial function with respect to each variable necessarily a bivariate polynomial?

polynomials field-theory

oct 18 at 6:34 Ewan Delanoy 8,178

5

9

votes

1

answer

360

views

+100

Finding Expressively Adequate truth Functions

combinatorics logic binary

oct 5 at 17:20 MJD 20.6k

3

22

votes

2

answers

442

views

+50

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

homework elementary-number-theory

feb 25 at 15:46 gekkostate 1,298

4

votes

1

answer

138

views

+100

Existences of enough integers which can be properly represented by a primitive binary quadratic form

elementary-number-theory

oct 4 at 22:11 John Wordsworth 9,343

10

24

votes

2

answers

541

views

+150

Countability of the zero set of a real polynomial

calculus linear-algebra polynomials roots

oct 1 at 10:26 Ewan Delanoy 8,178

3

11

votes

3

answers

451

views

+150

The Chinese remainder theorem and distributive lattices

ring-theory lattice-orders

jun 5 '12 at 15:48 Ewan Delanoy 8,178

1

5

votes

3

answers

167

views

+50

How does composition affect eigendecomposition?

linear-algebra eigenvalues eigenvectors

may 24 '12 at 15:36 Keivan 164

1

vote

1

answer

135

views

+100

Extending $f: X\subset \mathbb{R}^m\to\mathbb{R}^n$ an isometric immersion.

linear-algebra real-analysis metric-spaces

may 25 '12 at 8:46 Ewan Delanoy 8,178

2

3

votes

1

answer

153

views

+50

Need help to understand a theorem

linear-algebra matrices reference-request

2d ago Landscape 7,602

Ewan Delanoy

36 Earned bounties for 3,725 reputation