An Invariant of Smooth 4–Manifolds
نویسنده
چکیده
We define a diffeomorphism invariant of smooth 4–manifolds which we can estimate for many smoothings of R and other smooth 4–manifolds. Using this invariant we can show that uncountably many smoothings of R support no Stein structure. Gompf [11] constructed uncountably many smoothings of R which do support Stein structures. Other applications of this invariant are given. AMS Classification numbers Primary: 57R10
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