为了使二次曲线的作图更简便，文章以第二笛沙格定理和对合定理为基础，提出了一种新的作图方法。
Based on the Second Desargues Theory and involution theory, a simple drawing method for a conic is presented.
本文对弱上半连续多值映象给出了一个新的叠合定理。
In this paper, a new coincidence theorem for multivalued mappings of upper hemicontinuous is given.
本文对弱上半连续多值映象给出了一个新的叠合定理。由这叠合定理还导出了一些新的不动点定理。
In this paper, a new coincidence theorem for multivalued mappings of upper hemicontinuous is given. Some new fixed point theorems are obtained as a consequence of this coincidence theorem.
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