Searching for authors named "Freddy Dumortier" – sorted by Relevance.

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2 documents found, showing 1 through 2.

CANARD SOLUTIONS AT NON-GENERIC TURNING POINTS
by Peter De, Maesschalck, Freddy Dumortier
…Abstract. This paper deals with singular perturbation problems for vector fields on 2-dimensional manifolds. “Canard solutions ” are solutions that, starting near an attracting normally hyperbolic branch of the singular curve, cross a “turning point ” and follow for a while a normally repelling bran…
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On the decidability of semi-linearity for semi-algebraic sets and its implications for spatial databases
by Freddy Dumortier, Marc Gyssens, Dirk Van Guchtt — 1997 — In ACM Symposium on Principles of Database Systems
…Several authors have suggested to use first-order logic over the real numbers to describe spatial database applications. Geometric objects are then described by polynomial inequal-ities with integer coefficients involving the coordinates of the…
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