恒正 meaning in English
tsunemasa
Examples
- Since the project profits , the underlying assets , could become negative , a strategy of dividing the profits into the price and the cost is adopted to reduce the three uncertain factors to two . and then the stochastic partial differential equation is derived to satisfy the real options price that is induced by two underlying assets
针对项目收益即标的资产不满足恒正的问题，提出价格与成本分离的对策，把三种不确定因素简化成两种不确定因素，进而推导出源于两种标的资产的实物期权价格所满足的随机偏微分方程。 - In the second part , we investigate the compact submanifolds m with the parallel isoperimetric section in the real space forms rm ( c ) and prove that if there exists a parallel isoperimetric section on m , and the sectional curvature of m is always greater than zero , then m is contained in a hyper - sphere ; and get that the gauss curvature of the compact surfaces m with constant mean curvature in constant curvature space r4 ( c ) is always greater than zero , then m is a totally geodesic surface or a sphere , where an isoperimetric on m means a unit normal vector field defined globally on m with m1 ( ) = constant
( 2 )研究了实空间形式r ~ m ( c )中具有平行等参截面的紧致子流形m ，证明了具有一平行等参截面的子流形m ，如果m的截面曲率恒正，则m包含在r ~ m ( c )的一个超球面内；对于常曲率空间及r ~ 4 ( c )中具有常平均曲率的紧致曲面m ，如果m的高斯曲率处处大于零，则m或为r ~ m ( c )中的全测地曲面或为一球面。这里m上的等参截面是m上整体定义的单位法向量场，使得m关于它的平均曲率m _ 1 ( )是常数。 - Under this flow , the convex initial curve will preserve its perimeter , enlarge the enclosed area and make its curvature to be positive definitely . and as the time lasts , it will become more and more circular , and finally , as the time goes to infinity , the curve will converge to a circle in the hausdorff metric
本文证明在这种新的曲线流之下，闭凸曲线周长保持不变、所围区域的面积不断增大而曲率保持恒正(从而保持凸性) ，并且，随着时间的推移曲线变得越来越圆，最终当时间t趋向于无穷大时，曲线在hausdorff度量意义下收敛到一个圆周。