Another Application of the Alternating Map: Time-and-Band Limiting

Abstract

We use Castillo's dual formulation of classicality for the alternating map to reduce polynomial time-and-band limiting to two scalar problems. The reconstruction preserves polynomial cutoffs, multipliers and concentration forms. It recovers the symmetric Dunkl constructions of Castro and Grünbaum and applies to continuous and discrete inputs. Scalar recurrences avoid moment factorizations; positive integrals and residual bounds control the accuracy of the concentration values.