24,681 reputation
159145
bio website rybu.org
location Victoria, BC
age 41
visits member for 5 years, 1 month
seen 1 hour ago
I'm a professor of mathematics at the University of Victoria, in BC Canada.

17h
reviewed Close Proof of Kolomogrov-Sinai Theorem
17h
reviewed Close Roots in the solution
17h
reviewed Close How to construct a graph with arbitrarily large girth and large chromatic number?
17h
reviewed Close Fourier transform of a matrix represented compact lie group
17h
reviewed Close References: Solutions of the Bethe Ansatz Equations
17h
reviewed Close Schur covering group
17h
reviewed Close Image of (right) inverse trace map $\xi\colon H^{\frac 12}(\partial\Omega) \to H^1(\Omega)$ dense in $H^1(\Omega)$?
1d
awarded  Nice Answer
1d
revised Unstable homotopy groups of spheres beyond Toda's range
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revised Unstable homotopy groups of spheres beyond Toda's range
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revised Unstable homotopy groups of spheres beyond Toda's range
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revised Unstable homotopy groups of spheres beyond Toda's range
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answered Unstable homotopy groups of spheres beyond Toda's range
Dec
16
comment Polynomials of low degree that clone polynomials of higher degree
The wreath product means not only the permutations of the form $x_i \longmapsto x_{i+4}$ but also things like $x_i \longmapsto x_{i+1}$, i.e. you can permute the groups of four, but inside the groups of four you can also permute freely.
Dec
15
reviewed Close Alexander duality theorem
Dec
14
comment Why the definition of continuity is not reversed?
You might want to think about the purpose of the open-set definition, compared to the neighbourhood system definition, or the metric definition, or sequential definition. Going over some basic examples wouldn't hurt. I've flagged your question to be moved to the MSE site.
Dec
13
comment On a paper by Yoneda
Even if your university doesn't have it, they should be able to get a pdf scan of the document quickly via interlibrary loan. I'm not so sure I see the purpose of putting a request here, when any academic library can handle it rapidly.
Dec
13
reviewed Close How to solve this partial equation using weighted Laplacian Matrix?
Dec
13
reviewed Leave Open second fundamental form of boundary of convex subset non-negative?
Dec
11
reviewed Close What is a definition of functional morphism?