The depth first algorithm is then used to search for complete subtrees on the state trees,so that the corresponding Hamiltonian circuits could be found.

In order to get a good solution to the problem,an ID-based broadcast encryption scheme was designed using the latest HIBE algorithm based on Weil Pairings and the complete subtree method under the subset cover framework.

Now,the longing of the universal tree,a phylogenetic tree including all the species on the earth,is indubitably a realistic goal.

Some Properties and Structure of the Solution Sets of ■-Fuzzy Relational Equations in Infinite Domains and on a Complete Completely Distributive Lattice;