An invariant of smooth 4-manifolds.
Taylor, Laurence R. (1997)
Geometry & Topology
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Taylor, Laurence R. (1997)
Geometry & Topology
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Okun, Boris (2001)
Algebraic & Geometric Topology
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Kreck, Matthias (2001)
Geometry & Topology
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Alberto Tognoli (2003)
Bollettino dell'Unione Matematica Italiana
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We study the problem of approximating, up to homotopy, compact topological manifolds by real algebraic varieties. As a consequence, we realize any integral non-degenerate quadratic form as the intersection form of a real algebraic variety. This is related to a well-known result, due to Freedman [F], on the topology of closed simply-connected topological -manifolds.
Norman E. Hurt (1972)
Annales de l'I.H.P. Physique théorique
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Paul Cherenack (1995)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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