3 papers
math.NA2026
Korovkin type theorems for operators acting on functions of polynomial and exponential growth on
Ulrich Abel, Ana-Maria Acu, Margareta Heilmann +1
We prove two Korovkin-type approximation theorems for sequences of positive linear operators acting on continuous functions on . Under the assumption of pointwise conve…
math.CA2025
A representation for the integral kernel of the composition of multivariate Bernstein-Durrmeyer operators
Ulrich Abel, Ana Maria Acu, Margareta Heilmann +1
This paper presents a representation for the kernel of the composition of multivariate Bernstein-Durrmeyer operators for functions defined on the standard simplex in …
math.CA2025
Kernels for composition of positive linear operators
Ulrich Abel, Ana Maria Acu, Margareta Heilmann +1
This paper investigates the composition of Bernstein--Durrmeyer operators and Szász--Mirakjan--Durrmeyer operators, focusing on the structure and properties of the associated kern…