A associative ring R with an unit element is called an Ivolutive RIng,if every element of the muttiplicative group U/(R),which consists of all the units of R,sa
In this paper,applying the concept of generalized KKM map,we study problems of variational inequalities.We weaken convexity(concavity) conditions for a function
For the equation-u″+u|u|^q-1=λu(0<q<1,u≠0),there is no nonconstant periodic solution if λ≤0.In the case of λ>0,We give a sufficient and necessary conditio