When the definite matrix is non-positive,this paper studies the model of portfolio investment and it gives calculating method for optimal investment coefficient of proportionality,efficient boundary,unnecessary portfolio as well as arbitrage chance.
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One direct is from enterprise move to market . under this condition, this paper ,basing one the theory of transaction cost ,consider that VC is result from the change of efficient boundary of corporation.
从这个角度本文首先从交易费用角度分析虚拟企业的是企业效率边界变化的结果。
参考来源 - 虚拟企业形成机理研究及其应用·2,447,543篇论文数据，部分数据来源于NoteExpress
In fact, the efficient boundary of proxy didn't correspond to the efficient boundary of market.
而现实中，代理证券的有效边界与市场的有效边界是不一致的。
Entity EJB components were never intended to be serializable for efficient usage outside of the scope of the container or transaction boundary.
实体e JB组件从未打算成为可序列化的以供在容器和事务边界范围之外进行高效利用。
Compared with Finite Element Method and Finite Difference Method, Boundary Integral Equation Method is computationally more efficient.
与有限元法和有限差分法相比，该方法具有更高的计算效率。
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