It is known that if sequence $a_n\to a$, then for summability method $T$, we can get that $T(a_n)\to A$. The convers of this fact is known as Tauberian theory. This theory is extensively investigated from several authors, see for example ([1],[2], [3],[4], [5],[6], [7],[8]). In this presentation we will show Tauberian theorems under several summability methods, such are: Norlund-Euler summability method, Norlund-Cesarosummability method in ordinary convergence and in under statistically convergence, generalized Norlundsummability method. Then we will present Tauberian theorems in the 2-normed spaces for some summability methods including generalized Norlundsummability method, generalized Norlund-Euler summability method under statistically convergence in 2- normed spaces and Norlund-Cesarosummability method under statistically convergence in 2-normed spaces. 

Prof. Naim L. Braha has been working as a full professor in University of Prishtina since 2016.His subjects mainly include Mathematical analysis, functional analysis, real analysis, basic statistics, data analysis, mathematics for economy. The filed of interest: Banach Spaces; Operator Theory; Approximation Theory, Summability theory, Classical Fourier Analysis; Statistical convergences, Korovkin type theorems, Tauberian type theorems. Reviewer – Mathematical Reviews, USA.