الفهرس 
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Abstract
A study on some particular classes of infinite matrices.
It gives convenient methods for forming the associated matrices of a string and a semi block matrix .
The study obtained the associated matrices formed as matrices of transformation The thesis discusses the eigenvalues, eigenvectors ad principal vectors of associated matrices of a string and of a semi-block matrix.
The study investigates the associated matrices of two particularclasses of infinite matrices .
The first class is that of T - matrices .
The second class is the so-called Turnbull diagonal matrices.