One of the essential dilemmas in our lives is choosing between what is urgent and what is important. Years ago, Stephen Covey placed both issues on a 2x2 matrix, giving new light by having us consider ...
In this work, the notion of extended eigenvalues of a 2 × 2 lower triangular operator matrix has been researched. More precisely, the relations between the extended spectrum of a 2 × 2 lower ...
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