Al-Dolat, MohammedJaradat, ImadBaleanu, Dumitru2020-12-312020-12-312020Al-Dolat, Mohammed...at all (2020). "An extension of several essential numerical radius inequalities of 2x2 off-diagonal operator matrices", Advances in Difference Equations, Vol. 2020, No. 1.1687-1847http://hdl.handle.net/20.500.12416/4420In this work, we provide upper and lower bounds for the numerical radius of an nxn off-diagonal operator matrix, which extends some results by Abu-Omar and Kittaneh (Stud. Math. 216:69-75, 2013; Linear Algebra Appl. 468:18-26, 2015; Rocky Mt. J. Math. 45(4):1055-1065, 2015), and Paul and Bag (Appl. Math. Comput. 222:2731-2943, 2013).eninfo:eu-repo/semantics/openAccessNumerical RadiusOff-Diagonal PartOperator MatrixArticle2020110.1186/s13662-020-02795-7