Normative sentences can be used to change or to describe the normative system, known as prescriptive and descriptive obligations respectively. In applications of deontic logic it is important to distinguish these two uses of normative sentences. In this paper we show how they can be distinguished and analysed in a dynamic epistemic deontic logic.

Methotrexate is a folic acid antagonist and immunosuppressive agent, which is being increasingly used in various ocular inammatory diseases. Its use in ophthalmology has been increasing in recent years because of its anti-inammatory activity and corticosteroid-sparing objective. It is currently used in recurrent anterior uveitis, intermediate uveitis, posterior or panuveitis, scleritis, perip...

selecting sites for various uses is one of the final stages in land use planning. given the fact that the ‎favorable establishment of uses, which is influenced by a variety of factors, is the main reason that ‎helps lower the costs, the site selection of land uses in rural development plans should be able to ‎maintain its favorable position over time with the minimum changes so as to ensu...

this paper investigates the relationship between inflation and inflation uncertainty for the period of 1990-2009 by using monthly data in the iranian economy. the results of a two-step procedure such as granger causality test which uses generated variables from the first stage as regressors in the second stage, suggests a positive relation between the mean and the variance of inflation. however...