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HenrikRüping

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at.algebraic-topology

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Yearling

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16 posts edited

10 helpful flags

282 votes cast

Questions (81)

Votes Activity Newest

43	Are the rationals homeomorphic to any power of the rationals?
28	Which spaces are inverse limits of discrete spaces ?
28	Collatz conjecture for numbers of th form $2^n +1$
21	Tetrahedra with prescribed face angles
20	When is a extension of $\mathbb{Z}$ by a free group a CAT(0) group?

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Reputation (8,625)

+10	Does this group act geometrically on a Median space?
+10	When is a extension of $\mathbb{Z}$ by a free group a CAT(0) group?
+10	Which spaces are inverse limits of discrete spaces ?
+10	infinite dimensional CAT(0) groups

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Answers (60)

Votes Activity Newest

19	Example of an unnatural isomorphism
19	Proving that a group is free
16	The free group $F_2$ has index 12 in SL(2,$\mathbb{Z}$)
13	Examples of common false beliefs in mathematics
12	Homeomorphism-fixing subsets

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Tags (98)

53 at.algebraic-topology × 22	16 geometric-group-theory × 6
50 gn.general-topology × 33	15 ca.classical-analysis-and-odes × 5
28 reference-request × 11	11 ct.category-theory × 9
24 gr.group-theory × 23	11 differential-topology × 3
18 homotopy-theory × 5	10 mg.metric-geometry × 13

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Bookmarks (32)

Votes Activity Newest Views Added

169	Best online mathematics videos?
83	Are there non-scalar endomorphisms of the functor $V\mapsto V^{**}/V$?
74	Does every polyomino tile R^n for some n?
65	Does linearization of categories reflect isomorphism?
64	Video lectures for algebraic geometry

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Accounts (5)

	MathOverflow	8,625 rep	25 silver badges60 bronze badges
	Mathematics	962 rep	6 silver badges15 bronze badges
	Stack Overflow	113 rep	5 bronze badges
	Arqade	111 rep	1 bronze badge
	TeX - LaTeX	101 rep

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Necromancer × 4	Nice Question × 21
Popular Question × 16	Notable Question × 3
Nice Answer × 6	Excavator
Pundit	Revival × 2

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Votes cast (282)

all time			by type			month
279	up		82	question		1
3	down		200	answer		1

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