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  • Open Access English
    Authors: 
    Moulay Rchid Sidi Ammi; Mostafa Tahiri;
    Publisher: Refaad

    Fractional calculus has been widely used in mathematical modeling of evolutionary systems with memory effect on dynamics. In order to illustrate the efficiency of this non-integer order calculus, we employ SEIR models to model the dynamics, with and without memory, of t...

  • Open Access English
    Authors: 
    Jiyar Jafar Ahmed;
    Publisher: Refaad

    The aim of this study is designing the shape of corona virus (COVID-19) using the partial differential equation (PDE). The technique improvement was based on using an elliptic PDE as well as a set of four boundary conditions. The PDE method can generate surfaces of geom...