This paper is concerned with the problem of classifying tuples natural numbers a1,…,aK and b1,…,bL such that ratio factorials ∏i=1K(ain)!∕∏j=1L(bjn)! an integer for all n. A complete solution to this only known in case L−K=1, due work Bober building on observation Rodriguez Villegas, which relies Beukers–Heckman classification algebraic hypergeometric functions. We provide alternative proof res...

A risk ratio (sometimes called relative risk, both abbreviated to RR) and an odds ratio (OR) are ways of expressing a comparison between two proportions. For example, in this paper, there are two randomised groups in the trial, women in the lateral position and women in the supported sitting position in the passive second stage of labour. The authors wanted to compare the proportions of instrum...