نتایج جستجو برای: time dependent
تعداد نتایج: 2441197 فیلتر نتایج به سال:
Journal:
Journal of Sciences Islamic Republic of Iran
2011
N. Elyasi
In this paper Mathematical structure of time-dependent Lagrangian systems and their symmetries are extended and the explicit relation between constants of motion and infinitesimal symmetries of time-dependent Lagrangian systems are considered. Starting point is time-independent Lagrangian systems ,then we extend mathematical concepts of these systems such as equivalent lagrangian systems to th...
Journal:
:
2022
We study the asymptotic behaviour of an ecological model in presence a time dependent birth rate.
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