in this paper we introduce condition (e?p) a generalization of conditions (e?), (e) and (p) of acts over monoids and will give a classification of monoids by comparing this condition of their (rees factor) acts with other properties. we give also a criterion of cyclic acts to satisfy condition (e?p).

In living cells, new membranes are produced basically through two processes: mitosis and autopoiesis. These two processes have inspired two variants of cell-like membrane systems, namely P systems with active membranes and P systems with membrane creation. In this paper, we provide the first uniform, efficient solution to the SAT problem in the framework of recogniser P systems with membrane cr...

In 1979, Valiant proved that computing the permanent of a 01-matrix is #PComplete. In this paper we present another proof for the same result. Our proof uses \black box" methodology, which facilitates its presentation. We also prove that deciding whether the permanent is divisible by a small prime is #P-Hard. We conclude by proving that a polynomially bounded function can not be #P-Complete und...

Study of which the social work survey forms a part is anticipated and in that we shall deal again with some of the points raised earlier and those raised by critics such as your correspondent. However, lest your readers should misapprehend our tentative arguments, may I outline them here? The context is one of shortage of professionally qualified mental health social workers, particularly in th...