We introduce and explore a property of deductive data bases with updates wich we call total homeostaticity, and which substantially generalizes the following their property: ”for any given external update violating the integrity constraints there exists a reaction of the data base, which restores the integrity constraints”. This property is characteristic of active data bases. We explore the co...

A locally compact group G has property PL if every isometric G-action either has bounded orbits or is (metrically) proper. For p > 1, say that G has property BPLp if the same alternative holds for the smaller class of affine isometric actions on Lp-spaces. We explore properties PL and BPLp and prove that they are equivalent for some interesting classes of groups: abelian groups, amenable almost...

organizational culture is that has attracted the attention of a large number of specialists and interested people to management science because of its publicity ,and the term “culture “ alone with is synonyms has arrived into management literature in last decades. this topic has attracted such a great attention that has made managers very careful in decision making in all organization fields. o...

We present a theory of quadratic time-frequency (TF) energy distributions that satisfy a covariance property and generalized marginal properties. The theory coincides with the characteristic function method of Cohen and Baraniuk in the special case of "conjugate operators."

In this paper, we prove that there does not exist a set of 11 polynomials with coefficients in a field of characteristic 0 with the property that the product of any two distinct elements plus 1 is a perfect square. Moreover, we prove that there does not exist a set of 5 polynomials and the property that the product of any two distinct elements plus 1 is a perfect kth power with k ≥ 7. Combining...

In this paper, we introduce a notion of adjoint ideal sheaves along closed subvarieties of higher codimension and prove a restriction property of our adjoint ideal sheaves using characteristic p methods.

A property of extension is studied for solutions of linear elliptic systems of differential equations. We show that the dimension of the characteristic variety of the system plays a key role in the problem.

The sum of random variables that are identical and independent from an exponential distribution creates the compound distribution. It is called negative binomial as when number added follows This distribution’s characteristic function established by using mathematical analysis methods, included its uniform continuity property. function's parametric curves never disappear complex plane, which me...

We prove that the Fibonacci word f satisfies among all characteristic Sturmian words, three interesting extremal properties. The first concerns the length and the second the minimal period of its palindromic prefixes. Each of these two properties characterizes f up to a renaming of its letters. A third property concerns the number of occurrences of the letter b in its palindromic prefixes. It c...