We investigate under what conditions a co-recursively enumerable set S in a computable metric space (X, d, α) is recursive. The topological properties of S play an important role in view of this task. We first study some properties of computable metric spaces such as the effective covering property. Then we examine co-r.e. sets with disconnected complement, and finally we focus on study of chai...

This is a survey of the results obtained by K. G lazek and his co-workers. We restrict our attention to the problems of axiomatizations of n-ary groups, classes of n-ary groups, properties of skew elements and homomorphisms induced by skew elements, constructions of covering groups, classifications and representations of n-ary groups. Some new results are added too.

background:infant mortality is often used as a standard measure of a population’s health. until cause of sudden infant death syndrome is unknown (sids), the best strategy to decrease sids, is programming to decrease facing with risk factors. the aim of this study was to find the sids risk factors among families during their child care in iran. the study is the first in iran to examine the risk ...

this paper aims to study the performance of the international journal of information science and management (ijism) over a decade using scientometric approach. it also tries to study the                     co-authorship network of authors and institutions using different macro- and micro-level social network analysis metrics. a total of 173 articles published in 23 issues of the ijism covering...

Two nationwide studies examine endoscopist performance and colorectal cancer after colonoscopy. Surveillance screening colonoscopy is based on characteristics of removed adenomas but not the endoscopists. In this issue Gastroenterology, Wieszczy et al examined endoscopists (CRC) risk in a Polish cohort. A total 173,288 colonoscopies were performed between 2000 2011 followed up until 2017. Of 26...