On the bad points of positive semidefinite polynomials
نویسندگان
چکیده
A bad point of a positive semidefinite real polynomial f is at which pole appears in all expressions as sum squares rational functions. We show that quartic polynomials three variables never have points. give examples with the origin, are nevertheless sums formal power series, answering question Brumfiel. also an example complex not real, Scheiderer.
منابع مشابه
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ژورنال
عنوان ژورنال: Mathematische Zeitschrift
سال: 2021
ISSN: ['1432-1823', '0025-5874']
DOI: https://doi.org/10.1007/s00209-021-02804-9