The Dutch Differential Topology & Geometry seminar (DDT&G)

This seminar series is jointly organised by the universities of Amsterdam (Thomas Rot and Rob Vandervorst), Leiden (Federica Pasquotto) and Utrecht (Alvaro del Pino Gomez). The seminar aims to introduce a wide audience (starting at a master level) into various research areas in differential topology and geometry. Every meeting is a three-hour minicourse starting with an introduction to the field and ending with a discussion of open problems. Previous knowledge about the topic is not assumed. We strongly encourage master students with an interest in topology and geometry to attend. Please send an email to to be added to the mailing list. However, change spam into f.pasquotto.

Corona information

The fall seminars will be held online due to the pandemic. Zoom information can be found below.


02-10-2020: Marcello Seri on subriemannian geometry

Topic: Dutch Topology & Geometry Seminar
Time: Oct 2, 2020 02:00 PM Amsterdam
Zoom link
Meeting ID: 921 4146 2260
Passcode: 481730

  • 2:00-3:00 p.m.: first part of the talk/minicourse (accessible for master students)
  • 3:00-3:30 p.m.: coffee break/questions about part I
  • 3:30-4:30 p.m.: second part of the talk/minicourse (slightly more advanced level)
  • 4:30-...: more questions and discussions

In the first part of the seminar we will discuss what are sub-Riemannian structures, where do they come from and what are some of the major properties and open questions, using some famous examples to drive the discussion. For this part of the talk I will only assume some basic knowledge of Riemannian geometry and calculus of variation.
In the second part of the talk, we will discuss recent advances in sub-Riemannian spectral geometry, focussing in particular on the research around the meaning(s) of intrinsic sub-Laplacians, their self-adjointness and what we can learn from studying their spectra. The discussion will be structured to provide the main ideas and touch upon some of the major open questions. For this part of the talk I will assume some knowledge of functional analysis and operator theory.
Given the limited amount of time and to try and keep the talk understandable to the broadest audience, I will stay away from the most complex technicalities as much as possible. In any case, I will provide plenty of references for the interested participants and the more experienced audience.

30-10-2020: Stephan Mescher on topological complexity


Abstract: TBA

27-11-2020: Gabriele Benedetti on systoles

Location: TBA

Abstract: TBA