Discussion about Some Questions of the Profile Line
YE Xiao _ qin
DOI:10.11835/j.issn.1674-4764.1999.04.022
Received ,Revised , Accepted , Available online July 01, 2015
Volume ,1999,Pages 102-105
- Abstract
This paper discusses some questions about the profile line of space geometry,such as the judgement of the parallelism of the two profile lines with the same directions and the visibility about the skew lines and the reappeared points of profile lines, which make the solution of some questions in space geometry more easy than those commonly used.