In the algorithm,an idea that all maximum independent sets are formed straightway by deleting experiment is put forward and realized,that condition of maximum independent is satisfied gradually by doing time after time delete experiments.

In the closed circle DNA algorithm,an idea that complementary sets of vertex covering are formed straightway by delete experiment is put forward and realized,which has design of the algorithm inimitable and novel.

To realize filtering algorithm of SAT problem using DNA computing model,the data structure of 2n dimension vector is adopted to do DNA encoding,which represents a valuation of SAT problem,and delete experiment of closed circle DNA computing model can just complete selection of initial valuations to obtain feasible solutions of SAT problem.

It solved the problem of the conflict between teacher and grade and the problem of incorporate-class class by introducing group deleting experiment,solved the problem of normal incorporate-class class and problem of teacher s request of t.

This paper introduces different methods on how to add, delete, edit records in a database.

The paper is the later series of paper three,how to delete a node in a BT and keep its balance is the topic.

This paper introduces some methods of storing and processing tree structure in relation s database table, providing database table s structure and algorithms of search,insert,delete, modify.

AS mammal deletion of subdirectories one by one is a diverse and complicated operation, the executive command programmed with PASCAL language has been applicated in the computation center for automatically deleting them with higher effectiveness.

In general, there are some methods about maintenance ,for instance ,utility policy, deletion policy.