Al, Pembe İpekİsmailov, Zameddin2021-11-052021-11-052019-08-01https://doi.org/10.31801/cfsuasmas.474512http://hdl.handle.net/20.500.12575/75928In this paper, the boundedness and compactness properties of infinite tridiagonal block operator matrices in the direct sum of Hilbert spaces are studied. The necessary and sufficient conditions for these operators belong to Schatten-von Neumann class are given. Then, the results are supported by applications.enDirect sum of Hilbert spacesInfinite tridiagonal block operator matricesCompact operatorArticle682185218662618-6470