Immersed projective planes, Arf invariants and even 4-manifolds
Christian Bohr
math.GTarXiv:math/0201163
Abstract
In this paper, we exploit a subtle indeterminacy in the definition of the spherical Kervaire-Milnor invariant which was discovered by R. Stong to construct non-spin 4-manifolds with even intersection form and prescribed signature.
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