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

Konrad Schmüdgen

Mathematische Nachrichten · 1979 · 84 citations · 1 references

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1

Self-adjoint algebras of unbounded operators

Robert T. Powers · Communications in Mathematical Physics · 1971 · 277 citations · Full text

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