non-orientable surfaces;
Dehn twist;
mapping class groups;
crosscap slide;
D O I:
10.1007/BF02829656
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
We show that, for a closed non-orientable surface F, an automorphism of H, (F, Z) is induced by a homeomorphism of F if and only if it preserves the (mod 2) intersection pairing. We shall also prove the corresponding result for punctured surfaces.
机构:
Kansas State Univ, Math Dept, 138 Cardwell Hall,1228 N 17th St, Manhattan, KS 66506 USAKansas State Univ, Math Dept, 138 Cardwell Hall,1228 N 17th St, Manhattan, KS 66506 USA