‎In wireless communication systems‎, ‎space-time codes are applied to encode data when multiple antennas are used in the receiver and transmitter‎. ‎The concept of diversity is very crucial in designing space-time codes‎. ‎In this paper‎, ‎using the equivalent definition of full diversity space-time codes‎, ‎we first characterize all real and complex $2times 2$ rate one linear dispersion space-...

Let $mathcal {A} $ and $mathcal {B} $ be C$^*$-algebras. Assume that $mathcal {A}$ is of real rank zero and unital with unit $I$ and $k>0$ is a real number. It is shown that if $Phi:mathcal{A} tomathcal{B}$ is an additive map preserving $|cdot|^k$ for all normal elements; that is, $Phi(|A|^k)=|Phi(A)|^k $ for all normal elements $Ainmathcal A$, $Phi(I)$ is a projection, and there exists a posit...

Fantastic literature is one of the most popular genres in the world. Due to its wide scope, literary theoreticians have put forth numerous theories to explain its various dimensions. On the other hand, many Persian literary texts make use of these features, but they have not been sufficiently investigated yet. In the field of mysticism, due to the connection with supernatural affairs, numerous ...

the aesthetics of the stories of holy quran means identification of beauty and art in its expression. the quran is not a book of fictions, but its real stories, with religious and educational purpose, have artistically been expressed, with a rhetorical style and dynamic images that one can realize its artistic aspects in content and structure. the geometric structure of its stories makes it pos...