special projective group [数] 特殊射影群

binary projective group [数] 二元射影群

projective group ring 投射群环

projective group algebra 投射群代数

n-ary projective group n元射影群

Group Personality Projective Test 团体个性投射测验

projective special linear group [数] 特殊射影线性群

real projective symplectic group [数] 实射影辛群

projective system of topological group 拓扑的射影系