Geometric Group Thoery, Low-dimensional Topology, Contact and Simplectic Geometry

Recommended Texts or Study Materials

General Topology:

  • Algebraic Topology - Hatcher PDF
  • Differential Geometry (Manifolds, Vector fields, Differential forms)
  • Kirby Calculus (Handle decompositions, Heegaard diagrams) Recommended Refernece: 4-Manifolds and Kirby Calculus by Gompf and Stipsicz

Contact Geometry:

Geometric Group Theory:

  • Groups, Graphs, and Trees, Meier.
  • A Course on Geometric Group Theory, Bowditch. (This is available online, they are lecture notes)
  • Topological Methods in Group Theory, Scott and Wall.
  • Geometric Group Theory, Papazoglou.

Foundational Tools/Techniques/Ideas:

General Topology:

  • Computing the fundamental group, homology, and cohomology of various spaces. Covering spaces, deck transformations, cyclic covers, etc. Meyer-Vietoris.
  • Understand and be able to apply Universal Coefficient theorem, Kunneth Formula and Duality theorems

Geometric Group Theory:

  • Cayley graphs, quasi-isometry invariants (e.g. Gromov Hyperbolic, Dehn functions, boundary, etc.), CAT(k) spaces, Milnor Svarc Lemma.

Common Advisors and Committee Members

Geometric Group Theory:

Advisor 1 Committee Member 1 Committee Member 2
Dr. Pallavi Dani Dr. Shea Vela-Vick Dr. Dan Cohen

General Topology and Contact Geometry:

Advisor 1 Committee Member 1 Committee Member 2
Dr. Oliver Dasbach Dr. Shea Vela-Vick Dr. Pallavi Dani
Dr. Shea Vela-Vick Dr. Scott Baldridge Dr. Pallavi Dani

Previously asked questions

General Topology:

  • Prove that \(\mathbb{R}^m\cong \mathbb{R}^n \) iff \(m=n\). Next, compute the homology of \(S^n\).
  • Compute the homology of \(S^2\wedge S^1\).
  • Pick a graph of your choice (or for some CW complex), draw the 2-fold covering space, draw the universal covering space, What are the deck transformations?
  • Show why \( \mathbb{C}P^{2} \) is not the same as its orientation reverse using cohomology.
  • Show that for any connected closed orientable \(n\) manifold \(M\) there is a degree 1 map \(M \rightarrow S^n\)
  • \( \mathbb{R}P^3 \) is not homotopy equivalent to \( \mathbb{R}P^2 \vee S^3 \)
  • Show that a compact manifold does not retract onto its boundary
  • Show that for a degree 1 map \( f : M \ rightarrow N \) of connected closed orientable manifolds, the induced map on fundamental group is surjective, hence also the one induced in homology
  • Are there degree 1 maps from closed oriented genus \(g\) surface \(\Sigma_g \to \Sigma_h\) for arbitrary \(g\) and \(h\)? restrictions on \(g\) and \(h\)?
  • What does a regular covering space look like? Specifically, I had a base space of \(S^1\wedge S^1\), which has fundamental group \(F_2=\langle a,b \rangle\) and I constructed the covering spaces corresponding to the subgroups \(\langle a \rangle\) and \(\langle a^2, ab, ab^{-1} \rangle\) and had to explain why the latter covering space "looked" normal while the former covering space did not.

Geometric Group Theory:

  • Show that the genus 3 surface is a covering space of the genus 2 surface. (This was motived by showing that all fundamental groups of orientable surfaces with genus \( \geq 2 \) are Gromov hyperbolic).
  • Show that BS(1,2) is not a hyperbolic group (i.e. construct its Cayley graph and show its Dehn function has hyperbolic growth.)