الفهرس 
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Abstract
This thesis is concerned with the limit point case at infinity of the symmetric fourth order differential operator M = D2 P0 D2 – DP1D+P2 where D = d/dx,p0(x)andp2(x) for 0<x<are reasonably behaved on [0,.] the comain of M is taken to be those of f(x)in l2(0,.)for which f(3) (x) is absolutely continuous on (o, ) and MF is in L 2 (0,.)