space with π/2-Property具有π/2性质的空间
3)plane withπ/2-property具有π/2性质的平面
4)angle coneπ性质锥
1.It is proved that the Pareto optimal point exists on any weak bounded closed set in an ordered locally convex space with the closed cone with π property and on any bounded closed set in an ordered complete locally convex space with the closed angle cone or closed cone with π property.证明了带有π性质锥的序局部凸线性拓扑空间中的每一个有界弱闭集和带有π性质锥或角性质锥的序局部凸完备拓扑线性空间中的每一有界闭集存在Ｐａｒｅｔｏ－ｏｐｔｉｍａｌ点。
5)approximation/π property逼近/π性质
6)pionic structure and propertyπ介子的结构和性质
延伸阅读
π, π-conjugation分子式：CAS号：性质：单键和双键相互交替排列的共轭体系。最简单的为1,3-丁二烯，而苯分子则是一个具有高度对称结构的闭合共轭体系。除碳碳双键外，碳碳叁键、碳氧双键等，都可组成π,π-共轭。例如：CH2＝CH—C≡CH；CH2＝CH—CH＝O。由π,π-共轭引起的使分子内能降低、键长发生平均化等电子效应，称为π,π-共轭效应。
