ð There exists exactly three distinct points in the geometry. 

ð Any two distinct points are on exactly one line. 

ð Not all points are on the same line. 

ð Any two distinct lines are on at least one point


3점 기하학 정의는 이렇고

여기 모든 명제가 결정되어 있다는게 무슨뜻이고 어떻게 증명함?