On irreducible four--manifolds
classification
alg-geom
math.AG
keywords
irreduciblefour--manifoldsalmostcomplexeitherexamplesfiniteforms
read the original abstract
We show that minimal symplectic 4--manifolds with $b_2^+ >1$ and with residually finite fundamental groups are irreducible. We also give examples of irreducible orientable four--manifolds with indefinite intersection forms which are not almost complex with respect to either orientation.
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