Semi classical orthogonal polynomials on nonuniform lattices with respect to a linear functional
16302785&_mathId=si1.gif&_user=111111111&_pii=S0022247X16302785&_rdoc=1&_issn=0022247X&md5=2567d178f1b5a79dedf0dcf1c7e85f3a" title="Click to view the MathML source">L are defined as polynomials
16302785&_mathId=si2.gif&_user=111111111&_pii=S0022247X16302785&_rdoc=1&_issn=0022247X&md5=ec3c9a45a3d48ca160280bc57c1aab98" title="Click to view the MathML source">(Pn) where the degree of
16302785&_mathId=si102.gif&_user=111111111&_pii=S0022247X16302785&_rdoc=1&_issn=0022247X&md5=0b2d9f69e9fda8cf3597cf3b1212b1b2" title="Click to view the MathML source">Pn is exactly
n , the
16302785&_mathId=si102.gif&_user=111111111&_pii=S0022247X16302785&_rdoc=1&_issn=0022247X&md5=0b2d9f69e9fda8cf3597cf3b1212b1b2" title="Click to view the MathML source">Pn satisfy the orthogonality relation
and
16302785&_mathId=si1.gif&_user=111111111&_pii=S0022247X16302785&_rdoc=1&_issn=0022247X&md5=2567d178f1b5a79dedf0dcf1c7e85f3a" title="Click to view the MathML source">L satisfies the Pearson equation
where
ϕ is a non zero polynomial and
ψ a polynomial of degree at least 1. In this work, we prove that the multiplication of semi classical linear functional by a first degree polynomial, the addition of a Dirac measure to the semi-classical regular linear functional on nonuniform lattice give semi classical linear functional but not necessary of the same class. We apply these modifications to some classical orthogonal polynomials.