activity
20132022
most citedComposition operators with surjective symbol and small approximation numbers

2 citations · 4 across the 10 of their papers we have counts for

collaborators
Showing 2017Show all

1 paper · 1 filter

math.FA2017★ 1 cited

Some examples of composition operators and their approximation numbers on the Hardy space of the bi-disk

Daniel Li, Hervé Queffélec, Luis Rodríguez-Piazza

We give examples of composition operators on $H^2 (\D^2)$ showing that the condition is not sufficient for their approximation numbers to s…