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Halves of a real Enriques surface

1996
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Commentarii Mathematici Helvetici
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The real part E~ of a real Enriques surface E admits a natural decomposition in two halves, E R = E~)wE~ 2), each half being a union of components of E~. We classify the triads (E~; E~ ~), E~ 2)) up to homeomorphism. Most results extend to surfaces of more general nature than Enriques surfaces. We use and study in details the properties of Kalinin's filtration in the homology of the fixed point set of an involution, which is a convenient tool not widely known in topology of real algebraic

doi:10.1007/bf02566440
fatcat:m7fbbz2ojnfn7duzxjfadcizxy