That certain time in history

On certain semigroups of transformations that preserve double direction equivalence

Let TX be the full transformation semigroups on the set X. For an equivalence E on X, let TE(X) = {α ∈ TX : ∀(x, y) ∈ E ⇔ (xα, yα) ∈ E}It is known that TE(X) is a subsemigroup of TX. In this paper, we discussthe Green's *-relations, certain *-ideal and certain Rees quotient semigroup for TE(X).

on certain semigroups of transformations that preserve double direction equivalence

let tx be the full transformation semigroups on the set x. for an equivalence e on x, let te(x) = {α ∈ tx : ∀(x, y) ∈ e ⇔ (xα, yα) ∈ e}it is known that te(x) is a subsemigroup of tx. in this paper, we discussthe green's *-relations, certain *-ideal and certain rees quotient semigroup for te(x).

The Theory of “Living Time ” in Periodization of Iranian Architectural History

The writing of Iranian architectural history has, from its start, followed the principles of western historiography. Portions of this history are well expected to be neglected or unattended when writing of it takes place outside its intellectual framework that essentially reflects the Iranian throught world. To have a truly Iranian architectural historiography, one has to find the theoretical p...

The eigenvalues of matrices that occur in certain interpolation problems

The eigenvalues of the matrices that occur in certain finitedimensional interpolation problems are directly related to their well posedness and strongly depend on the distribution of the interpolation knots, that is, on the sampling set. We study this dependency as a function of the sampling set itself and give accurate bounds for the eigenvalues of the interpolation matrices. The bounds can be...

OPTIMUM SELECTION AND SCALING OF ACCELEROGRAMS REQUIRED IN TIME HISTORY ANALYSIS OF SPATIAL STRUCTURES