J4 ›› 2010, Vol. 23 ›› Issue (6): 20-25.
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SHU Peng-Hua
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Abstract:
This paper addresses the orbit equation ∑′ passing a fixed point and the midpoint in the secant of a fixed quadratic surface and the orbit equation ∑″ of a point dividing a line segment in a given ratio between a fixed point and a moving point of a quadratic surface. This paper further presents such orbit equations as ∑′ and ∑″ for seventeen quadratic surfaces and derives two important conclusions for typepreserving of quadratic surfaces.
Key words: quadratic surface, typepreserving, typepreserving transformation
CLC Number:
O182.2
SHU Peng-Hua. On Simplification of TypePreserving[J].J4, 2010, 23(6): 20-25.
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