like other developing countries, iranian cities are growing and expanding physically at a high speed. for about five decades, the only policy of the urban development plans in the field of urban growth management has been definition of the urban growth boundary (u.g.b.) which is still used without any major modifications.despite the slight evidences indicating the ineffectiveness of the current...

like other developing countries, iranian cities are growing and expanding physically at a high speed. for about five decades, the only policy of the urban development plans in the field of urban growth management has been definition of the urban growth boundary (u.g.b.) which is still used without any major modifications.despite the slight evidences indicating the ineffectiveness of the current...

We consider the di?erential equation f<sup>''</sup> +A(z)f<sup>'</sup> +B(z)f = 0, where A(z) and B(z) are entire complex functions. improve various restrictions on coe?cients prove that all non-trivial solutions of in?nite order.

The purpose of this study is to explain the statistical variation in economic growth rates in a broad cross-section of countries, over the period 1980-99. This problem will be addressed within the framework of the so-called “growth-regression” approach, which seeks to explain this variation by relating economic growth to a list of potential explanatory variables. A large number of studies publi...

‎let $g$ be a finite group and $pi_{e}(g)$ be the set of element‎ ‎orders of $g$‎. ‎let $k in pi_{e}(g)$ and $m_{k}$ be the number of‎ ‎elements of order $k$ in $g$‎. ‎set nse($g$):=${ m_{k} | k in‎ ‎pi_{e}(g)}$‎. ‎in this paper‎, ‎we prove that if $g$ is a group such‎ ‎that nse($g$)=nse($psl(2‎, ‎25)$)‎, ‎then $g cong psl(2‎, ‎25) $‎.