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The determination of derivative parameters for a monotonic rational quadratic interpolant
Explicit formulae are developed for determining the derivative parameters of a monotonic interpolation method of Gregory and Delbourgo (1982)
Regularity of probability laws by using an interpolation method
We study the problem of the existence and regularity of a probability density
in an abstract framework based on a "balancing" with approximating absolutely
continuous laws. Typically, the absolutely continuous property for the
approximating laws can be proved by standard techniques from Malliavin calculus
whereas for the law of interest no Malliavin integration by parts formulas are
available. Our results are strongly based on the use of suitable Hermite
polynomial series expansions and can be merged into the theory of interpolation
spaces. We then apply the results to the solution to a stochastic differential
equation with a local H\"ormander condition or to the solution to the
stochastic heat equation, in both cases under weak conditions on the
coefficients relaxing the standard Lipschitz or H\"older continuity requests
Real Interpolation method, Lorentz spaces and refined Sobolev inequalities
In this article we give a straightforward proof of refined inequalities
between Lorentz spaces and Besov spaces and we generalize previous results of
H. Bahouri and A. Cohen. Our approach is based in the characterization of
Lorentz spaces as real interpolation spaces. We will also study the sharpness
and optimality of these inequalities
Integrals of a C-1-compatible triangular surface element
Definite integrals are evaluated for the cardinal functions of an interpolation method which provides C sup 1 continuity over a triangular grid
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