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Example of a system which is computation universal but not effectively programmable

✍ Scribed by Michael Conrad; Otto Rössler

Publisher
Springer
Year
1982
Tongue
English
Weight
263 KB
Volume
44
Category
Article
ISSN
1522-9602

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An Example of a Positive Polynomial whic
An Example of a Positive Polynomial which is not a Sum of Squares of Polynomials A Positive, but not Strongly Positive Functional
✍ 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