On how new century textbooks dealing with the contents of algebraic expressions;

The complexity and the degree of the algebraic expression for the Sbox are symbols of resistance of block ciphers against the interpolation attacks.

In some algebraic expressions,their denominators can be rationalized by multinomials as well as by determinants.

An optimal method and an algere method for the synthesis of mechanism of fly shear mechanism have been introduced in this pape r and their respective characterstics have been discussed on an example.

In view of the problem that the direct parametric modeling is difficult to be clearly expressed by using the formex algebra,an indirect parametric modeling approach for spatial grid structures was given.

Using formex algebra theory,this paper compiles procedure in FORTRAIN language in order to configurate automatically for a structure of special shape,such as globe,hyperboloid and paraboloid ,etc,and avoid previous tedious work.

The basic concepts and theories of formex algebra and the present state of the formex configuration processing were put forward on the basis of those methods.

Unfortunately,the construction of PS bent functions is theoretic,it is still an open problem to characterize the algebraic normal forms of PS bent functions.