TY  - JOUR
AU  - Faried, Nashat 
AU  - Hassanain, Z.A. 
AU  - Abd El Ghaffar, H. 
AU  - Lokman, A. 
PY  - 2019
TI  - S-Numbers of Weighted Shift Operators on P-Summable Formal Entire Functions of M-Variables
JF  - Journal of Mathematics and Statistics
VL  - 15
IS  - 1
DO  - 10.3844/jmssp.2019.79.85
UR  - https://thescipub.com/abstract/jmssp.2019.79.85
AB  - The idea of multiplying a formal Taylor power series by z to make a right shift operator on the space of all square summable sequences of real numbers was due to A.L. Shield. In this work, we consider Taylor power series in m-variables and we give upper and lower estimations of s-numbers for multiplication of m- right weighted shift operators. This allowed us to estimate upper bounds for s-numbers of infinite series of m-right weighted shift operators and give some applications.