From Betti numbers to l2-Betti numbers
Snapshots of modern mathematics from Oberwolfach
We provide a leisurely introduction to l2-Betti numbers, which are topological invariants, by relating them to their much older cousins, Betti numbers. In the end we present an open research problem about l2-Betti numbers.
If you are interested in translating this Snapshot, please contact us at email@example.com