The main subject of this course is the topology and the geometry of 3-manifolds. In the first half of the course, we begin by explaining a relation between the torus and the Farey tessellation, and then explain the topological classification theorem of (once-punctured) torus bundles over the circle and that of 2-bridge links from the viewpoint of the Farey tessellation. In the latter half of the course, we first explain basic facts in hyperbolic geometry and then explain concrete constructions of the hyperbolic structures and the canonical decompositions of once-punctured torus bundles and 2-bridge link complements. We intend to explain an intimate relation between the topology and the geometry of 3-manifolds through once-punctured torus bundles and 2-bridge link complements, which form special but important families of 3-manifolds.
・Be familiar with the Farey tessellation and its relation with the torus
・Understand the classification theorems of 2-bridge links and punctured torus bundles
・Be familiar with basic facts in hyperbolic geometry
・Understand intimate relation between the topology and the geometry in dimension three through 2-bridge links and punctured torus bundles
knot theory, hyperbolic geometry, 2-bridge links, once punctured torus bundles, Farey tessalations
✔ Specialist skills | Intercultural skills | Communication skills | Critical thinking skills | Practical and/or problem-solving skills |
This is a standard lecture course. There will be some assignments.
Course schedule | Required learning | |
---|---|---|
Class 1 | The following topics will be covered in this order: - the (once-punctured) torus and the Faray tessellations - the classification theorem of (once-punctured) tori from the viewpoint of the Farey tessellation - the classification theorem of 2-bridge links from the viewpoint of the Farey tessellation - Jorgensen -Floyd-Hatcher decompositions of once-punctured torus bundles and their analogies for 2-bridge link complements - basic facts in hyperbolic geometry - the Epstein-Penner decompositions of cusped hyperbolic manifolds - Jorgensen's work on once-punctured Kleinian groups and their extension | Details will be provided during each class session. |
To enhance effective learning, students are encouraged to spend approximately 100 minutes preparing for class and another 100 minutes reviewing class content afterwards (including assignments) for each class.
They should do so by referring to textbooks and other course material.
None required.
J. S. Purcell, Hyperbolic knot theory, Graduate Studies in Mathematics 209, American Mathematical Society, Providence, RI, 2020. H. Akiyoshi, M. Sakuma, M. Wada, and Y. Yamashita, Punctured torus groups and 2-bridge knot groups (I), Lecture Notes in Mathematics 1909, Springer, Berlin, 2007.
Assignments (100%).
To have basic knowledge in the theory of differentiable manifolds