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alg-geom1996★ 1 cited
Separation of Semialgebraic Sets
F. Acquistapace, C. Andradas, F. Broglia
In this paper we study the problem of deciding whether two disjoint semialgebraic sets of an algebraic variety over R are separable by a polynomial. For that we isolate a dense sub…
alg-geom1993
An algorithmic criterion for basicness in dimension 2
F. Acquistapace, F. Broglia, M. Pilar Velez
We give a constructive procedure to check basicness of open (or closed) semialgebraic sets in a compact, non singular, real algebraic surface . It is rather clear that if a semi…
alg-geom1993
On Brauer Groups of Real Enriques Surfaces
V. V. Nikulin, R. Sujatha
Let Y be a real Enriques surface, _2Br(Y) the subgroup of elements of order 2 of Br(Y), and s, s_{or}, and s_{nor} the number of all connected, connected orientable, and connected…