symplectic manifold;
symplectomorphism;
almost complex structure;
a-genus;
D O I:
10.1007/s10455-005-1939-0
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
We prove that there exist diffeomorphisms of tori, supported in a disc, which are not isotopic to symplectomorphisms with respect to the standard symplectic structure. This yields a partial negative answer to a question of Benson and Gordon about the existence of symplectic structures on tori with exotic differential structure.