In this paper we consider the initial-boundary value problem for a second orderhyperbolic equation with initial jump.The bounds on the derivatives of the exact
This paper studies the free bending vibration of cylindrical tank partially filled withliquid and submerged in water.The depths of liquid and water may be compl
In this paper we give some results of integrability and several classes of integrableequations of first-order nonlinear ordinary differential equations.Many kno