Geodesic
Continous, piecewise-polynomial functions which solve Hilbert's 17th problem.
Journal für die reine und angewandte Mathematik, Tome 440 (1993), pp. 157-174.

Voir la notice de l'article provenant de la source European Digital Mathematics Library

Mots-clés : piecewise-polynomial functions, sup-inf-polynomially definable functions, almost -rings, real closed field, Hilbert's 17th problem, continuous PWP functions, Stengle's Nichtnegativstellensatz, Stellensätze, SIPD functions, real spectrum 
@article{JRAM_1993__440_153537,
     author = {Charles N. Delzell},
     title = {Continous, piecewise-polynomial functions which solve {Hilbert's} 17th problem.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {157--174},
     publisher = {mathdoc},
     volume = {440},
     year = {1993},
     zbl = {0774.12003},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1993__440_153537/}
}
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Charles N. Delzell. Continous, piecewise-polynomial functions which solve Hilbert's 17th problem.. Journal für die reine und angewandte Mathematik, Tome 440 (1993), pp. 157-174. http://geodesic.mathdoc.fr/item/JRAM_1993__440_153537/