The latter is not required, especially because it's a difficult value to gauge, but it does provide options for people who want to limit the printing of graphically intensive files.

In view of the traditional making technology of smooth limit gauge, a method of plating surface is put forward. The process of technology has been studied, has been tried and has been fairly effect.

A (1+1)-dimensional lattice U(1) gauge model is solved exactly and the result shows that this model has correct continuum limit.