Glasnik Matematicki, Vol. 38, No.1 (2003), 111-120.
A NOTE ON QUASI-ISOMETRIES II
S. M. Patel
Department of Mathematics, Sardar Patel University,
Vallabh Vidyanagar, Gujarat, India
Abstract. An operator A on a complex Hilbert space H
is called a quasi-isometry if A*2 A2 =
A* A. In the present article,
some structural properties of quasi-isometries are established
with the help of operator matrix representation.
2000 Mathematics Subject Classification.
47A62, 47A63, 47B20.
Key words and phrases. Hilbert space, isometry, spectrum, operator matrix.
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