This paper investigates the converse theorem of rectangular projection theorem in descriptive geometry,and furthermore supplements and confirms another converse theorem,If the projection of two lines intersecting vertically fo rms a rectangle on a certain projecting plane,at least one line of the two lines is parallel to the projecting plane.

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All quadrilateral mesh automatic generation for regular quadric surfaces based on Auto CAD AME;2. Represent Quadric Surfaces Using NURBS and Calculate the Control Vertecs and Weights;3. Through study,the property is found out that planes cutting edgewise quadric curve and quadric intersections from the quadric surfaces become the harmonic division.

文中采用了射影幾何的方法日韩人人操人人摸，證明了畫法幾何中關(guān)于兩個(gè)二次曲面相交的著名的復(fù)切定理和蒙日定理免费观看自拍第69页，通過研究得出了周切線平面和交線平面成調(diào)和分割的性質(zhì)，同時(shí)還得出了處于復(fù)切的二次曲面必存在相公切的二次曲面的性

This thesis consists of five chapters. At first, We introduce the study history as well as present situation on KKM theory. Secondly, We discuss the invariability of transfer open valued multimap under the restriction of upper and lower semicontinuity on generalized convex spaces. Then, We obtain new KKM type theorems from the classical KKM theorem by applying upper and lower semicontinuity. We also obtain intersection theorems by applying the KKM type theorems for a multimap from a topological space to another topological space. Further, We obtain Ky-Fan type coincidence theorem by applying known variational results on the KKM type theorems. Finally, We give an application to new theorems.

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Bifurcations of Zero Crossings: The isotopy theorem [50], [1] shows that transversal intersections are structur-ally stable, i.e., that "transversal zero-crossings" are structurally stable: their topological properties do not change if the size of the filter is slightly changed.

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intersection ring：交環(huán)

交數(shù) intersection number | 交環(huán) intersection ring | 相交定理 intersection theorems

intersection theorems：相交定理

交環(huán) intersection ring | 相交定理 intersection theorems | 交叉積 intersectionproduct

intersectionproduct：交叉積

相交定理 intersection theorems | 交叉積 intersectionproduct | 區(qū)間代數(shù) interval algebra

intersectionproduct：交*積

intersection theorems 相交定理 | intersectionproduct 交*積 | interval 區(qū)間