A Discussion On the Rationality of the Derivation of Logarithm;

This paper pointed out that,auxiliary derivation can avoid the application of the system of linear equations,thus simplify the calculation process.

This paper first shows an identity,then in virtue of variable substitution and derivation and the identity offered two types of new differential equations are given,and their integrability isproved.

A footnote about derivation rule of compound function;

The paper gives a derivation rule of the power exponential function and analyzes some common calculation methods.

By means of variable substitution and complex functional derivation method,this paper gives a new kind of four order different equation,some kind of solution with sufficient and necesiory conditions.

The paper gives four kinds of differential equation and their expressions; and by means of derivation method of functional iteration and variable upper limit equation it discusses about their integrality.

By means of variable transformation and derivation method,this papers gives the sufficient conditions of one kind of new nonlinean differential equation,and puts forth the general solution of parameters.

A novel method called load derivation is introduced for ultra-short term load forecasting of power system.

The comparision of the method to several definite differential optimization methods is done.