The article not only presents the first, second and third elemental form of pseudo sphere, but also the third elemental form of conoid and curve.
The article not only presents the first, second and third elemental form of pseudo sphere, but also the third elemental form of conoid and curve.
摘要不但给出了伪球面的第一基本形式、第二基本形式及第三基本形式，而且给出了一般曲面的第三基本形式。