It’s surprisingly difficult to prove one of the most basic properties of a number: whether it can be written as a fraction.
The assumption in the main result of Basic differential forms for actions of Lie groups (Proc. Amer. Math. Soc. 124 (1996), 1633 ...
Polynomial interpolation to analytic functions can be very accurate, depending on the distribution of the interpolation nodes.
Abstract: In this paper we consider the problem of sparse signal modeling by means of rational functions. Our dictionary is ...
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