MATRIX 2019 Interactions: Exercises

Revision as of 13:53, 6 January 2019

This page lists the exercises for consideration during the MATRIX 2019 Interactions meeting.

Participants are encouraged to work on the exercises and contribute solutions on the discussion page.

1 Surgery: high-d methods in low-d

1.1 Normal maps and the surgery obstruction

1. Stability of vector bundles (Ex)
2. Normal maps - (non)-examples (Ex)
3. Immersing n-spheres in 2n-space (Ex)
4. Surgery obstruction, signature (Ex)
5. Surgery obstruction, Arf-invariant (Ex)

2 The (stable) Cannon Conjecture

2.1 Lecture 1: An introduction to 3-manifolds

1. Betti numbers of 3-manifolds (Ex)
2. Non-prime solvable fundamental groups (Ex)
3. Atoroidal 3-manifolds (Ex)
4. Three dimensional Heisenberg group (Ex)
5. Circle actions on 3-manifolds (Ex)

2.2 Lecture 2: An introduction to hyperbolic groups

1. Torsion-free solvable hyperbolic groups (Ex)
2. Fundamental groups of surfaces (Ex)
3. Minimal dimension of BG (Ex)
4. Extensions of groups (Ex)
5. Boundaries of Fuchsian groups (Ex)

3 Invariants of knots from Heegaard Floer homology