Torstein Ulsnæs

Slides

• Qualifying exam slides
• Slides NCG seminar talk (21/03/23)

Notes

• Exactness of the reduced crossed product functor for discrete groups (a very short survey)
• On ergodic invariantstates and irreduciblerepresentations

External links:

Blogs
• Personal blog (not much here..)

Database resources
• GroupProps - A Wiki dedicated to groups and their properties
• Liegroups.org - A database of (a few) Lie groups and their structure theory. May requires you to install their cli software.
• pi-base - Database of topological spaces. Hidden gem!
• Math Counterexamples - Site dedicated to counterexamples in mathematics.
• Graded rings database - A database of, well, graded rings in algebraic geometry.
• The database of ring theory - Similar to pi-base, but for ring theory.
• The On-Line Encyclopedia of Integer Sequences - This site helps you match integer sequences against known sequences.
• Jahrbuch Database -A database (well... a collection of dead links with no search field) of old mathematical articles (1868-1942).

Reviews, citations and the likes
• Zentralblatt Now open to the public!
• MathScinet Closed to the public!
• Scopus Citations database

Preprint, archives and open journals
• arXiv!!
• The Front for arXiv (Currently down - June 2021)
• University of Texas at AustinDART-Europe E-theses Portal
• SISSA Open Science (Lecture notes (well... lecture note, since it is just one), workshops and preprints)

Open problems
• Open problems in operator algebras (a long list of open problems by Prof. Jesse Peterson)