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A continuous and rational solution to Hilbert's
17th problem and several Positivstellensatz cases.

A continuous and rational solution to Hilbert's
17th problem and several Positivstellensatz cases. pdf

with Delzell C., González-Vega L., in:
Computational Algebraic Geometry. Eds. Eyssette F., Galligo A..
Birkhäuser (1993) Progress in Math. No109.
(colloque MEGA 92)
(1993), 61-76.
** Abstract :**
From the
Positivstellensatz we construct a continuous and rational
solution for Hilbert's 17-th problem and for
several cases of the Positivstellensatz. The solutions are
obtained using an especially simple method.