For computing Padé approximants, we present presumably stable recursive algorithms that follow two adjacent rows of the Padé table and generalize the well-known classical Levinson and Schur recurrences to the case of a nonnormal Padé table. Singular blocks in the table are crossed by look-ahead steps. Ill-conditioned Padé approximants are skipped also. If the size of these lookahead steps is bo...

This review study aimed to examine the relationship between Coronavirus (COVID-19) and its uses in renin-angiotensin-aldosterone system (RAAS) to infect the patient using the related studies in this regard. Finally, the logical method of using the related medicine, and the benefits and harms of using these Medications will be indicated in the treatment of novel coronavirus. It is hoped that a s...