An improved criterion on equal amount of portfolio selection has been proposed,after analyzing the Markowitz s portfolio selection model.

Dynamic evidence combination rules based on time conversion;

On the basis of analyzing and comparing some typical researches,a new approximation algorithm was proposed,which could not only accelerate the speed of evidence combination,but also overcome a defect of sacrifice precision for speed in old approximation algorithms and ensure accuracy of fusion results.

By Applying the financial securities combination theory and Bayes method a kind of securities profit prediction model is constructed.

In this paper, the author discussed the best securities combinations in class 1 safety field, provided the optimized controlling strategies to investors who want the fortune meets the scheduled target as soon as possible, took some data analyses on detailed target fortune and parameters of financial market, by which worked out the minimum average time to gain the scheduled target fortune.

In this paper,a direct combinatorial proof of the sum of squares is presented by employing mathematical induction.

In this paper,the author gives simpler combinatorial proofs of two q-cubes using integer partition,which were given by Garrett,Hummel and Zhao Guangjun.

A study of the specialization of transaction costs and optimal portfolio of the superior asset;

Study of portfolio with transaction costs;

Study on the efficient frontier characters of portfolio;