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Cheerful Parsnip's user avatar
Cheerful Parsnip's user avatar
Cheerful Parsnip's user avatar
Cheerful Parsnip
  • Member for 13 years, 8 months
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About

I like low-dimensional topology and geometric group theory. I'm particularly drawn to problems that involve algebraic spaces of graphs, such as graph homology.

Check out my mathematical blog, IHX.

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88
Does $X\times S^1\cong Y\times S^1$ imply that $X\times\mathbb R\cong Y\times\mathbb R$?
May 19, 2013
39
Are the rationals minus a point homeomorphic to the rationals?
Dec 10, 2010
39
Function which is continuous everywhere in its domain, but differentiable only at one point
Feb 12, 2012
33
Intuitive explanation of Left invariant Vector Field
Jan 8, 2011
29
How To Present Algebraic Topology To Non-Mathematicians?
Oct 25, 2013
26
Why do all compact connected surfaces have a triangulation?
Apr 16, 2011
26
What is $\pi_2(\mathbb{R}^2 - \mathbb{Q}^2)$?
Feb 17, 2012
26
Number of ways to partition a rectangle into n sub-rectangles
Oct 31, 2010
25
Can you give me an example of topological group which is not a Lie group.
Dec 26, 2015
25
Alternative proof that the parity of permutation is well defined?
Jun 20, 2011
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How do the experts here deal with low-level questions?
7
Fair use MathSciNet?
6
Undoing a downvote
4
Is there any way to find and view a deleted question that I commented on recently
3
When $\LaTeX$-ifying, please use stacked fractions
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Is it appropriate to assign Mechanical Turk-type tasks as extra credit?
55
How misleading is it to regard $\frac{dy}{dx}$ as a fraction?
47
Are there examples of non-orientable manifolds in nature?
39
What makes four dimensions special?
38
Why are there no wild arcs in the plane?