الفهرس 
INTlIODOCTIOIiOnly 14 pages are availabe for public view
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Abstract
This thesis consists of four chapters : Chapter I ”Expansions in eigenfunctions of selfadjoint operators” consists of 3 sections. Chapter II ”Positive definite functions of infinitely many variables in infinite dimensional spaces” consists of 4 sections. Chapter III ”Unitary representations of topological groups” consists of 3 sections. Chapter IV ”Integral representations of positivedefinite generalized kernels in spaces of functions of infinite number of variables”consists of 2 sections.