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math.CA2017
Sobolev extremal polynomials with respect to mutually singular measures
A. Diaz Gonzalez, G. Lopez Lagomasino, H. Pijeira Cabrera
We consider extremal polynomials with respect to a Sobolev-type -norm, with and measures supported on compact subsets of the real line. For a wide class of such ext…
math.CV2017
Inverse results on row sequences of Hermite-Padé approximation
G. López Lagomasino, Y. Zaldivar Gerpe
We consider row sequences of (type II) Hermite-Padé approximations with common denominator associated with a vector of formal power expansions about the origin. In terms…