By means of variable substitution and partial integration,this paper gives the integral conditions of one kind of first- order differential equation and puts forth the expression of general solution,and gets the simplified method of seeking solutions.

This paper points out the variable substitution method of triple integral of ellip-tical volume and examples its applications.

Two techniques of chaos synchronization, variable substitution and variable feedback, are applied to Lorenz systems.

This paper discusses the different mothods of progamming between a multi--usernetwork information system, involving the problems of setting of share environment,collisiontreatment,array variable replacement and data integrity.

In this paper,the author sums up how to choose the variable replacement.

,the active control method,global control method and variable replacement method.

In this paper,the corresponding methods of proof on the problem of triple integral variable replace formula were tallied up first.

The article puts forward the concept of homogeneous differential equation Class 1 and gives the method of getting integrating factor and its solver theorem through variable replace,the conclustion of which is an expansion of relavant documents.

Basing on a new kind of transformation of variables, several groups of integrable conditions and the corresponding first integrals are obtained.

We establish an equivalence between the generalized strongly complementarity problems and the Wiener Hopf equations by using a change of variables technique.