A. S. Meligy, Expansions for the Logarithmic-Integral and Cosine-Integral Functions, Proceedings of the Royal Irish Academy. Section A: Mathematical and Physical Sciences, Vol. 59 (1957/1958), pp.

As corollaries we obtain the optimal order of convergence for functions from the Sobolev spaces $\ [H_p^s\]$ with isotropic, anisotropic, or mixed smoothness with given compact support for all values ...

These architectures facilitate the efficient implementation of complex functions such as logarithmic and exponential operations, which are crucial in numerous signal processing applications.