The concept of Lucky k-polynomials and in particular Lucky χ-polynomials was recently introduced. This paper introduces Stirling number of the fourth kind and Lucky partitions of a finite set in order to determine either the Lucky k- or Lucky χ-polynomial of a graph. The integer partitions influence Stirling partitions of the second kind.

Background and Aim: One of the main concerns in dental society is the enormous prescription of antibiotics. Unnecessary prescription of antibiotics causes resistant bacterial species. The aim of this study was to evaluate the attitude of dentists toward antibiotic prescription in endodontic treatments and the role of related factors. The study was conducted in Sanandaj city, Kurdistan province,...

because of reducing the number of spectators of football premier league, this study is seeking for identifying factors put the most impact on this decline. the statistical population consisted of all spectators in iran football premier league in 2015-16, out of which 395 spectators were randomly selected as the research samples. the data were collected via a researcher-made questionnaire. the f...

restriction of option of meeting place to the sale contract is treated as incontrovertible in both shiite jurisprudence and iranian civil code in such a way that it is considered among necessities of shiite jurisprudence by some and a matter of consensus by others. however, malik and abu hanifa radically denied the prevailing opinion and shafi‘i had his own idea in this connection. since transa...

In this paper, a new model is proposed for the integrated logistics network designing problem. In many research papers in this area, it is assumed that there is only one option for the capacity of each facility in the network. However, this is not a realistic assumption because generally there may be many possible options for the capacity of the facility that is being established. Usually the c...

background: dengue is amongst the most serious mosquito-borne infectious disease with hot spots in tropical and subtropical parts of the world. unfortunately, no licensed vaccine for the disease is currently available in medicine markets. the only option available is the management of dengue vector mosquito, aedes aegypti (diptera: culicidae). method: predatory potential of five odonate nymphs ...

The paper presents a framework with multiple periods in which the delay option makes coordination between a large number of agents with payoff strategic complementarities more difficult because it increases the incentive to free-ride on the information provided by the observation of the aggregate level of activity. It analyzes conditions under which the option to delay facilitates or hampers th...