Pade-Lanczos approximant

We recall that the Lanczos continued fraction is equivalent to the Pade-Lanczos approximant, which is defined in Eq. (207) through its polynomial quotient or equivalently via the sum of the Heaviside partial... 

The Lanczos algorithm and the Pade approximant have also been combined in other research fields, for example, in computational and applied mathematics [2], as well as in engineering via circuit theory [59]. The authors of Refs. [59, 60] from 1995, being apparently unaware of the earlier work [48] from 1972, rederived through a different procedure the Pad6-Lanczos approximant and called it the Pad6 via Lanczos (PVL) method. 

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