We consider second order elliptic partial differential equations with coefficients that are singular or degenerate at an interior point of the domain. This paper presents formulation and analysis of a ...
Transactions of the American Mathematical Society, Vol. 347, No. 6 (Jun., 1995), pp. 2161-2167 (7 pages) Let Sn be the collection of all algebraic polynomials of degree ≤ n with nonnegative ...