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When σ is a quasi-definite moment functional. We consider a point mass perturbation T of σdefined by.where λ and uk,0≤k≤N, are complex numbers and N is a non-negative integer. We first find a necessary and sufficient condition under which there is an orthogonal polynomical system
Relative To T.We then investigate various properties
including semi-classical character of T when σ is semi-classical
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