Danny Ruberman's user avatar
Danny Ruberman's user avatar
Danny Ruberman's user avatar
Danny Ruberman
  • Member for 14 years, 2 months
  • Last seen this week
6 votes

Residual finiteness of hyperbolic 3-manifold groups

6 votes
Accepted

Slice knots in 3-manifolds

6 votes

Daunting papers/books and how to finally read them

2 votes

Can orientation preserving diffeomorphism in $\mathbb{R}^d$ be presented by flowmap of dynamical systems? (time-varying case)

23 votes
Accepted

What can we say about the Cartesian product of a manifold with its exotic copy?

6 votes

Kirby diagrams of Mazur manifolds

1 vote

First usage of the terms pseudo-isotopy and concordance in manifold theory

14 votes

4-manifold $M$ with intersection form of Leech lattice

5 votes
Accepted

Computation of the linking invariant on Lens spaces

13 votes

Exotic smooth structure

8 votes
Accepted

Hyperbolic homology spheres with infinite $\mathrm{SL}_2(\mathbb{C})$ character variety

5 votes

Open book decompositions in dimension 4

7 votes

In knot theory, what is this link property and how to detect it: "linkings between components separate nicely"

7 votes
Accepted

Lens space bounding a topological, simply-connected 4-manifold with $b_2=1$

4 votes
Accepted

Explicit examples of Classical, Flat $U(2)$-connections on a torus link complement with non-trivial holonomy

11 votes
Accepted

Small knots becoming isotopic after connect sum

1 vote

Realize as homology a given polynomial ring

7 votes

Dual surfaces of a first cohomology class of a 3-manifold

4 votes
Accepted

Index formula for elliptic operators acting on Sobolev sections vanishing on the boundary (say $D: H_0^k(\Omega) \to H_0^{k-1}(\Omega)$)

12 votes
Accepted

Kervaire-Milnor group of homotopy spheres and smooth Poincaré conjecture

7 votes
Accepted

Fickle's argument for Mazur manifolds

2 votes
Accepted

An example of handle decomposition on modified $S^5$

2 votes
Accepted

Is $\pi_2 (X_i)$ a free $\mathbb{Z}\pi_1 (X_i)$-module for $i=1,2$?

3 votes
Accepted

A definition of linking number for knots in $S^3$ using chains in $D^4$

6 votes
Accepted

What were the "questions unapproachable by other means" w.r.t. $KO$-invariants?

4 votes

Reference request: A knot is tame if and only if it has a tubular neighbourhood

2 votes
Accepted

Concrete descriptions of $S^1$-bundles over smooth manifold $Y$ underying a K3 surface

12 votes

The convex hull of a manifold whose cobordism class is trivial

7 votes

Converse to Hopf degree theorem

10 votes

Surgery along knots and connected sum

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