2 papers
math.OA2026
Operator systems and positive extensions over discrete groups
Evgenios T. A. Kakariadis, Malte Leimbach, Ivan G. Todorov +1
The extension problem asks whether positive semi-definite functions on a symmetric unital subset of a discrete group can be extended to positive semi-definite functions on the whol…
math.OA2025
Convergence of Peter--Weyl Truncations of Compact Quantum Groups
Malte Leimbach
We consider a coamenable compact quantum group as a compact quantum metric space if its function algebra is equipped with a Lip-norm. By using…