many results were proved on the structure of finite groups with some‎ ‎restrictions on their real elements and on their conjugacy classes‎. ‎we‎ ‎generalize a few of these to some classes of infinite groups‎. ‎we study groups in which real elements are central‎, ‎groups in which real elements are $2$-elements‎, ‎groups in which all non-trivial classes have the same finite size and $fc$-groups w...

in pakistan the growing number of higher education institutions and the ever-increasing number of students, forces the institutions to build such an environment which completely satisfies these students’ expectations. this paper uses a modified version of keaveney and young (1997) satisfaction model and tests on a sample of students of comsats abbottabad, pakistan. the study is based on primary...

A ring $R$ is a strongly clean ring if every element in $R$ is the sum of an idempotent and a unit that commutate. We construct some classes of strongly clean rings which have stable range one. It is shown that such cleanness of $2 imes 2$ matrices over commutative local rings is completely determined in terms of solvability of quadratic equations.

Abstract Let $${{\mathcal {S}}}{{\mathcal {S}}}$$ S and {C}}}$$ C be the strictly singular cosingular operators acting between Banach spaces, let $$P\Phi _+$$ P Φ + perturbation classes for upper ...

p.h.d student in history of civilization and islamic nation. although the historiographical books believe that biograhpical historiography (put the people in different social classes for historical studies) is one of the most uthentic kinds and branches of muslims' historiography, but we can not find, easily, the trace of this branch in historiographical books. and even we can not find the...