In this paper,we have proved several theorems which guarantee that the Lienardequation has at least one or n limit cycles without using the traditional assmupti
A tensor method for the derivation of the equations of rigid body dynamics,based onthe concepts of continuum mechanics,is presented.The formula of time derivati
In this paper,we study the general structure of evolution equations of the AKNSeigenvalue problem q(x,t),r(x,t)with the spectrum varying asand A<sub>1</sub>,B<sub>1