Walter D. van Suijlekom

collaborators

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

Quadratic Forms, Real Zeros and Echoes of the Spectral Action

Alain Connes, Walter D. van Suijlekom

For a real distribution $D$ on the interval $[0, L]$ with $D ~$ the associated even distribution on the interval $[- L, L]$ , we prove that if the associate…