Whitney's Trick for Three 2-Dimensional Homology Classes of 4-Manifolds

Masayuki Yamasaki
1979 Proceedings of the American Mathematical Society  
In his recent paper, Y. Matsumoto has defined a triple product of 2-homology classes of simply-connected oriented 4-manifolds, when the intersection numbers are zero. In the present paper, the author establishes that three 2-homology classes can be homotopically separated if the intersection numbers and the triple product vanish.
doi:10.2307/2042774 fatcat:otdlnveyl5cjtac2aorbdeyj7y