HenrikRüping

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youtube.com/user/HenrikRuep
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at.algebraic-topology

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Answers

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21

Example of an unnatural isomorphism

Aug 14, 2013

21

Bijection $\varphi:\mathbb{N}\to\mathbb{N}$ that distorts every finite arithmetic progression

Jun 4

19

Proving that a group is free

Mar 16, 2010

17

Are there space filling curves for the Hilbert cube?

Aug 11, 2010

17

The free group $F_2$ has index 12 in SL(2,$\mathbb{Z}$)

Oct 26, 2010

Questions

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54

Are the rationals homeomorphic to any power of the rationals?

May 26, 2010

36

Collatz conjecture for numbers of th form $2^n +1$

Jan 4, 2011

32

Which spaces are inverse limits of discrete spaces ?

Feb 16, 2010

26

Tetrahedra with prescribed face angles

Feb 24, 2010

22

When is a extension of $\mathbb{Z}$ by a free group a CAT(0) group?

Feb 1, 2011

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at.algebraic-topology

72

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gn.general-topology

71

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37

posts

gr.group-theory

47

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29

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reference-request

45

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15

posts

co.combinatorics

45

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13

posts

Reputation

+60

For $\mathbb R^n \times Q \cong \mathbb R^m \times Q $ must $n = m$? ($Q$ is the Hilbert cube)

+25

Reference for surjectivity of the canonical map $R^{G_1} \otimes R^{G_2} \to R^{G_1 \cap G_2}$

+20

G-equivariant homotopy between G-spaces

+10

What is a good intuition for a general operad?

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