User Aufwind - Mathematics Stack Exchange

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	766 reputation	bio	website		visits	member for	2 years, 1 month
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3

14

votes

4

answers

254

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Solve recursion $a_{n}=ba_{n-1}+cd^{n-1}$

may 12 at 1:17 vonbrand 6,578

1

10

votes

1

answer

286

views

How to “explain” Szemerédi's Regularity Lemma so that classmates may understand its value?

graph-theory

mar 10 at 12:28 Arthur Fischer♦ 21.3k

2

10

votes

3

answers

766

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Stirling number of the first kind: Proof of Recursion formula

homework combinatorics stirling-numbers recurrence-relations

jun 3 '11 at 4:39 Yuval Filmus 25.9k

2

10

votes

2

answers

310

views

Summation by parts of $\sum_{k=0}^{n}k^{2}2^{k}$

homework sequences-and-series discrete-mathematics

may 3 '11 at 15:55 Aufwind 766

1

7

votes

11

answers

526

views

Good examples for mathemathical problems/statements that are easely solvable/provable in one theory and hard to solve/prove in another

soft-question math-history big-list education

dec 11 at 2:29 proximal 2,119

2

7

votes

5

answers

596

views

Why is it possible to conclude everything from a false statement? [duplicate]

logic

jul 26 '11 at 5:59 Zhen Lin 20.9k

1

6

votes

2

answers

165

views

Why is this equation $\sum_{k=0}^{\infty}k^2\frac{\lambda^k}{k!e^\lambda}=\lambda +\lambda^2$ true?

probability sequences-and-series

dec 14 '11 at 1:14 Michael Hardy 48.1k

1

5

votes

2

answers

157

views

Why is $\partial\partial M=\varnothing$?

general-topology analysis manifolds differential-topology

apr 14 at 16:27 julien 22.7k

4

votes

2

answers

111

views

Does this problem have a name?

number-theory soft-question terminology recurrence-relations

feb 4 at 17:06 Henning Makholm 53.6k

4

votes

1

answer

171

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Understanding characteristic functions in probability theory.

integral probability-theory

feb 7 '12 at 17:48 Michael Hardy 48.1k

3

4

votes

1

answer

2

kviews

Calculation of the n-th central moment of the normal distribution $\mathcal{N}(\mu,\sigma^2)$

homework probability normal-distribution

dec 22 '11 at 2:46 Robert Israel 86.4k

3

votes

1

answer

23

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Calculating $d\omega$ for $\omega\in\Omega^{k}M$ explicitly for $k=2$

analysis differential-geometry

apr 19 at 16:29 Ehsan M. Kermani 3,334

3

votes

1

answer

80

views

Show that the complements of maximum matchings (extended down) form a matroid

homework graph-theory matroids

jun 25 '12 at 11:07 Holdsworth88 3,465

3

votes

1

answer

158

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Are these two versions of the dominated convergence theorem equivalent?

real-analysis measure-theory probability-theory

dec 16 '11 at 10:26 t.b. 43.2k

1

3

votes

3

answers

152

views

While calculating: Why do I get $1-P(A^c)\neq P(A) $?

probability

jul 19 '11 at 13:49 André Nicolas 161k

3

votes

1

answer

162

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Proof: BEST-IN-GREEDY-Algorithm for Matroids maximizes all Bottleneck-Functions over Bases

homework combinatorics algorithms discrete-mathematics matroids

jul 6 '11 at 6:00 Yuval Filmus 25.9k

3

votes

1

answer

184

views

Assuming $G=(V(G),E(G))$ is a graph what does $\Delta(G)$ mean?

graph-theory discrete-mathematics matroids

jul 6 '11 at 0:11 Aufwind 766

1

2

votes

3

answers

2

kviews

Does “iff” mean “if and only if” $(\Longleftrightarrow)$?

notation

jul 12 at 22:17 skullpatrol 282

2

votes

2

answers

128

views

Proof of some statements involving conditional expectation

homework measure-theory probability-theory

may 18 '12 at 16:21 Michael Hardy 48.1k

2

votes

1

answer

136

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If $|X|$ is $\mathcal{F}$-measurable. Is $X$ $\mathcal{F}$-measurable, too?

measure-theory probability-theory

may 2 '12 at 10:55 Davide Giraudo 56.2k

2

votes

1

answer

60

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Show that $\mathcal{F}_{G}$ is an Independence System, but in general is no Matroid

homework graph-theory discrete-mathematics matroids

jul 6 '11 at 17:48 Yuval Filmus 25.9k

1

vote

1

answer

75

views

How to prove: For each $\mathcal{E}\subset\mathcal{P}(\Omega)$ exists an $\alpha(\mathcal{E})$?

measure-theory probability-theory

aug 4 at 13:50 Davide Giraudo 56.2k

1

vote

2

answers

91

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How to prove $\left\{ \omega|X(\omega)=Y(\omega)\right\} \in\mathcal{F}$ is measurable, if $X$ and $Y$ are measurable?

measure-theory probability-theory

may 2 '12 at 15:57 Did 103k

1

vote

1

answer

4

kviews

Calculating maximum-likelihood estimation of the exponential distribution and proving its consistency

homework probability probability-theory probability-distributions

jan 23 '12 at 8:47 Aufwind 766

1

vote

1

answer

519

views

Understanding a proof of Chebyshev's inequality

probability probability-theory

jan 14 '12 at 8:58 Davide Giraudo 56.2k

1

vote

2

answers

69

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Have I calculated the sum $\sum\limits_{k=1}^\infty\frac{q\lambda^k}{k!e^\lambda}$ correctly?

homework sequences-and-series

dec 12 '11 at 3:20 J. M. 38.9k

1

vote

1

answer

103

views

What does unique “minimal” partition mean (Context: Partitioning of Vertex-Sets)?

graph-theory definition

oct 27 '11 at 4:15 Brian M. Scott 154k

1

vote

1

answer

116

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Proof for Matroids: Independence Oracle is polynomial equivalent to Basis Super-Set Oracle

homework combinatorics graph-theory discrete-mathematics matroids

jul 5 '11 at 5:57 Brian M. Scott 154k

0

votes

1

answer

46

views

What do those different separators of arguments mean?

notation

sep 10 at 14:18 Aufwind 766

0

votes

1

answer

130

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Characterizing Open/Closed/compact sets in the metric space $(\mathbb{Z}^n,d)$

homework metric-spaces

apr 16 '12 at 16:23 Xabier Domínguez 725

Aufwind

35 Questions