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The main focus in this paper consists of extending the main results of Diagana (2015) to linear relations. Moreover, we apply our obtained results to study some properties of 3×3-block matrices of linear relations in the form, A≔(ABCDEFGHK). Namely, we show that under some suitable conditions on relations B,C,F,D,G and H, the relation A is closed if and only if A,E and K are closed. In addition, we...
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