Statistical function method, researched by Reeds and others, can deal efficiently with a kind of statistics. But an obvious deficiency is that statistical funct
In this paper authors consider a class of the first order nonlinear neutral differential equations with several delay arguments. Sufficient conditions are obtai
Since [1] established the Pohozaev identity in bounded domains, this identity has been the principal tool to deal with the non-existence of the equation
In this paper, we use the upper-lower solution method with the theory of monotone operators to obtain the existence of coupled weak quasi-solutions of the follo