Similary solution of the system of partial differential equation of second order b and its application

The system of partial differential equation of second order has some conditions in which it lays on definite coefficients of this differential equation and the solution is similary. For the example porous plate motion in viscous incompressible conducting fluid is considered; Where the similary solution lais on velocity of motion of plate, as well as velocity of suction and axternal magnetic field.

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