CAJ | 학술논문

熟知欧氏参数曲面在非脐点处有且仅有两个相互垂直的主方向。对相互垂直的理解是容易的，但文献[3]的处理方法在实际教学中，学生理解主方向只有两个时存在模糊之处。本文目的是仔细分析这些模糊之处及产生的原因，并给出较为清晰的补充修缮，以更好地为教学服务。
숙지구씨삼수곡면재비제점처유차부유량개상호수직적주방향。대상호수직적리해시용역적，단문헌[3]적처리방법재실제교학중，학생리해주방향지유량개시존재모호지처。본문목적시자세분석저사모호지처급산생적원인，병급출교위청석적보충수선，이경호지위교학복무。
It is known that there are exactly two perpendicular principal directions at a non umbilical point on a parameterized surface. It is easy to understand that the two principal directions are perpendicular. However, omissions and ambiguities still exist in[3] concerning to explain why there are exactly two principal directions. This paper tries to analyze the reasons and clean omissions and ambiguities, aiming to serve the teaching well.