26,356 reputation
168153
bio website rybu.org
location Victoria, BC
age 41
visits member for 5 years, 10 months
seen 9 hours ago
I'm a professor of mathematics at the University of Victoria, in BC Canada.

4h
awarded  Necromancer
9h
reviewed Close $\mathsf{GCD}$ in arithmetic progression
9h
reviewed Close Why should “small” P be preferred?
9h
reviewed Close Does the language suggest hard average cases?
15h
reviewed Close Tensor product of algebra group and banach space
16h
reviewed Close Radius of convergence of Taylor expansion of $z \mapsto (1 - z \cdot a)^{-1}$
16h
reviewed Close Avoiding the range of a bivariate integer function or Diophantine function
16h
reviewed Close Notation: $Sigma$ and $Pi$ of intersections
16h
reviewed Close $AXB$ sort of decomposition?
16h
reviewed Close A compact Alexandrov space with curvature bounded below has curvature bouneded above?
18h
comment Is $\mathbb{R}^3 \setminus \mathbb{Q}^3$ simply connected?
It's essentially the same transversality argument one uses to show $\pi_k S^n$ is trivial for $k < n$. Only you notice you can make the map simultaneously transverse to a countable collection of manifolds.
1d
comment Is $\mathbb{R}^3 \setminus \mathbb{Q}^3$ simply connected?
There's a direct argument for this using the transversality-extension theorem.
Aug
27
comment Geodesics on SO(3)
Regarding Q2, the answer is yes.
Aug
26
comment What manifolds are bounded by RP^odd?
@sara: I'm using the standard linear actions, so that's why the spaces are standard. Are you wondering whether or not one can construct similar bundles with non-standard smooth structures on two of the three spaces?
Aug
23
awarded  Necromancer
Aug
23
accepted Persistent homology of Gaussian Fields in Euclidean space
Aug
23
answered Persistent homology of Gaussian Fields in Euclidean space
Aug
22
reviewed Close Commutator of a matrix as matrix multiplication
Aug
22
reviewed Close Hermitian Matrices over Quaternions with Rank at most k
Aug
19
reviewed Close Unique extension of the absolute value