User vonjd - Mathematics Stack Exchange

bio	website	ephorie.de
	location	Germany
	age	43
visits	member for	2 years, 9 months
	seen	yesterday
stats	profile views	192

	2,045 reputation	bio	website	ephorie.de	visits	member for	2 years, 9 months
1124 badges		location	Germany		seen	yesterday

4

39

votes

14

answers

3

kviews

How to round 0.4999… ? Is it 0 or 1?

arithmetic

apr 21 at 13:13 Marc van Leeuwen 23.5k

27

24

votes

4

answers

3

kviews

Connection between fourier transform and taylor series

mar 19 '11 at 8:49 Christian Blatter 32.3k

12

16

votes

2

answers

1

kviews

Connections between metrics, norms and scalar products (for understanding e.g. Banach and Hilbert spaces)

functional-analysis vector-spaces banach-spaces hilbert-spaces inner-product-space

sep 3 '11 at 10:43 t.b. 43.1k

9

12

votes

2

answers

2

kviews

Difference between metric and norm made concrete: The case of Euclid

vector-spaces norm metric-spaces normed-spaces

may 12 '11 at 7:21 André Nicolas 160k

6

9

votes

6

answers

2

kviews

How are eigenvectors/eigenvalues and differential equations connected?

linear-algebra intuition differential-equations examples-counterexamples eigenvectors

may 11 '12 at 11:36 vonjd 2,045

1

8

votes

3

answers

298

views

Proof for law of complex exponents using only differential equation

complex-analysis differential-equations complex-numbers exponentiation

jun 26 '11 at 20:42 Aryabhata 47.4k

1

7

votes

5

answers

951

views

Common misconceptions about math

soft-question big-list education philosophy meta-math

feb 16 '11 at 2:17 beroal 883

1

7

votes

1

answer

357

views

Taylor expansion to show that for Stratonovich stochastic calculus the chain rule takes the form of the classical one

calculus intuition stochastic-processes

dec 11 '10 at 17:47 Raskolnikov 6,845

4

6

votes

1

answer

854

views

intuition for complex eigenvalues

linear-algebra matrices intuition complex-numbers eigenvalues

dec 23 '10 at 9:50 Gunnar Magnusson 1,556

2

5

votes

2

answers

184

views

Accessible Intro to Random Matrix Theory (RMT)

linear-algebra random

mar 17 at 15:24 Ipsen 100

4

5

votes

2

answers

1

kviews

Examples for proof of geometric vs. algebraic multiplicity

linear-algebra intuition eigenvalues eigenvectors examples-counterexamples

jun 12 '12 at 10:08 Community♦ 1

1

5

votes

1

answer

122

views

Function for concatenated semicircles

functions

sep 12 '11 at 0:35 Zev Chonoles♦ 52.7k

2

4

votes

2

answers

120

views

Birthday paradox: Comparing the original version with the same-birthday-as-you version

probability combinatorics

mar 13 at 10:54 vonjd 2,045

4

votes

2

answers

432

views

integral transforms: why do roots in frequency domain correspond to eigenvalues in time domain (and how does it help solve differential equations)?

differential-equations eigenvalues integral-transforms big-picture laplace-transform

may 15 '11 at 14:50 Marty Green 497

1

3

votes

1

answer

146

views

Integral paradox: Deterministic integral interpreted as limiting case of stochastic integral

calculus stochastic-integrals

jan 24 '12 at 21:23 Michael Hardy 47.7k

1

3

votes

1

answer

79

views

How to verify that the average is really a simple calculation?

probability combinatorics

sep 25 '11 at 12:16 joriki 92.1k

1

3

votes

1

answer

95

views

How to calculate the expected value when betting on which pairings will be selected

probability combinatorics

sep 25 '11 at 9:26 vonjd 2,045

1

3

votes

7

answers

361

views

Looking for functions $f$ with $\int_{-\infty}^{\infty}f(x)\,dx = 1$.

big-list calculus analysis

jul 26 '11 at 20:15 Arturo Magidin 158k

3

votes

4

answers

235

views

Question about direct sum of function space

linear-algebra functional-analysis vector-spaces

jul 5 '11 at 13:19 Willie Wong♦ 30.6k

1

3

votes

3

answers

629

views

Connection between eigenvalues and eigenvectors of a matrix in different bases

linear-algebra eigenvalues eigenvectors

jun 24 '11 at 21:25 vonjd 2,045

1

3

votes

2

answers

354

views

Why does a diagonalization of a matrix B with the basis of a commuting matrix A give a block diagonal matrix?

linear-algebra matrices eigenvectors

jun 20 '11 at 21:37 Arturo Magidin 158k

2

3

votes

1

answer

442

views

Why is the ratio test for L=1 inconclusive?

sequences-and-series intuition limit convergence

apr 17 '11 at 9:34 Chris Eagle 20.6k

1

3

votes

1

answer

667

views

Connection between chain rule, u-substitution and Riemann-Stieltjes integral

calculus integral intuition

apr 5 '11 at 18:18 Arturo Magidin 158k

1

3

votes

1

answer

91

views

Software for proving sum identites

combinatorics computer-algebra-systems sequences-and-series

jan 25 '11 at 11:03 Anthony Labarre 338

1

3

votes

3

answers

318

views

Loss of information when multiplying by singular matrix

linear-algebra group-theory

nov 14 '10 at 10:06 Jonas Meyer 34.9k

1

2

votes

2

answers

165

views

Software for simulating (partial) differential equations

pde math-software

jan 21 at 21:01 doraemonpaul 2,993

1

2

votes

1

answer

193

views

Which internal angles can a lattice polygon have?

geometry proof-strategy discrete-geometry integer-lattices

feb 4 '12 at 3:17 Martin Sleziak 20.3k

1

2

votes

1

answer

279

views

Why does an equiangular spiral become logarithmic (intuitively)?

intuition plane-curves logarithms

oct 25 '10 at 15:39 J. M. 38.8k

1

vote

4

answers

97

views

How to prove that the limit is max(0,x)?

limit

mar 12 at 17:34 Cameron Buie 27.2k

1

vote

2

answers

161

views

How to solve combinations of differentials and integrals?

calculus analysis integral

feb 26 at 16:54 user64087 1

vonjd

47 Questions