Dan Rust

Milton Keynes, UK

https://sites.google.com/view/danrust/

Lecturer - Open University, UK

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Slice of pizza with no crust

geometry euclidean-geometry puzzle asked Sep 1, 2013 at 18:38

math.stackexchange.com

99 votes

Geometric way to view the truncated braid groups?

group-theory group-actions knot-theory combinatorial-geometry braid-groups asked Jun 3, 2013 at 15:48

math.stackexchange.com

37 votes

Homeomorphic to the disk implies existence of fixed point common to all isometries?

general-topology metric-spaces fixed-point-theorems asked Sep 20, 2013 at 18:39

math.stackexchange.com

31 votes

Does taking the direct limit of chain complexes commute with taking homology?

category-theory homological-algebra homology asked May 24, 2013 at 16:03

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29 votes

Examples of falsified (or currently open) longstanding conjectures leading to large bodies of incorrect results.

soft-question math-history big-list conjectures asked Mar 31, 2013 at 17:47

math.stackexchange.com

20 votes

Can the n-string sphere braid group embed in to the (n+1)-string sphere braid group?

braid-groups knot-theory gr.group-theory asked Jan 21, 2013 at 15:53

mathoverflow.net

16 votes

Name of this interesting variant of Tic-tac-toe?

identify-this-game tic-tac-toe asked Nov 23, 2013 at 4:30

boardgames.stackexchange.com

15 votes

Relation Between Truncated Braid Groups and Regular Tilings of the Complex and Hyperbolic Plane

gr.group-theory braid-groups tiling reference-request asked May 27, 2013 at 16:14

mathoverflow.net

14 votes

Equivalences and isomorphisms of short exact sequences

group-theory category-theory homological-algebra abelian-groups exact-sequence asked Apr 4, 2013 at 23:05

math.stackexchange.com

13 votes

Can the n-string sphere braid group embed in to the (n+1)-string sphere braid group?

group-theory algebraic-topology homotopy-theory low-dimensional-topology knot-theory asked Apr 25, 2012 at 15:22

math.stackexchange.com

Top Answers

An intuitive idea about fundamental group of $\mathbb{RP}^2$

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Does $G\cong G/H$ imply that $H$ is trivial?

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Unit sphere in $\mathbb{R}^\infty$ is contractible?

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What is the mathematical significance of Penrose tiles?

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What are the most overpowered theorems in mathematics?

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Example of a non-hausdorff space

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Simply connected manifolds are orientable

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Are these 2 graphs isomorphic?

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Visually deceptive "proofs" which are mathematically wrong

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Are there any open mathematical puzzles?

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Proving that $\mathbb{F}^\infty$ is infinite-dimensional.

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What is the oldest open problem in geometry?

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List of interesting math podcasts?

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Topological Meaning of semi-direct product

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What is $\pi_{31}(S^2)$?

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Area of intersection between two circles

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Homology group of Real projective plane

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Why should Rubik's cube get attention from mathematicians?

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Does every irrational number contain arbitrarily long sequences of some digit?

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What does it mean when a bound is sharp?

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Image of Intersection of sects not equal to intersection of images of sets

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Pi might contain all finite sets, can it also contain infinite sets?

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Higher Homotopy Group of a Product of Spaces

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Fundamental group of the Klein bottle, using action of a group?

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$\mathbb{S}^2$ as a fibre bundle

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Decomposable Families of Shapes

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What is so special about triangles?!

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a example of two space that are homotopy equivalent but not homeomorphic

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$H_2(M)$ is free abelian for any simply connected $4$-manifold

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Prove that some set is compact directly from definition

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