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An Example of Uniformly Recurrent Function which is not Almost Periodic

✍ Scribed by Alain Haraux; Philippe Souplet


Publisher
SP Birkhäuser Verlag Boston
Year
2004
Tongue
English
Weight
68 KB
Volume
10
Category
Article
ISSN
1069-5869

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An Example of a Positive Polynomial whic
✍ Konrad Schmüdgen 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 187 KB

In 1888 D. HILBERT showed the existence of a real polynomial in two variables of sixth degree which is non-negative on the real plane without being a finite sum of squares of polynomials ([2]; see e.g. [l]). The existence of such polynomials has important consequences in the theory of unbounded oper