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- W2904290839 abstract "New families of nonnegative biquadratic forms that have 8, 9 or 10 real zeros in $mathbb{P}^2times mathbb{P}^2$ are constructed. These are the first examples with 8, 9 or 10 real zeros. It is known that nonnegative biquadratic forms with finitely many real zeros can have at most 10 zeros; our examples show that the upper bound is obtained. Such biquadratic forms define positive linear maps that are not completely positive. Our constructions are explicit, and moreover we are able to determine which of the examples are extremal." @default.
- W2904290839 created "2018-12-22" @default.
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- W2904290839 date "2016-11-29" @default.
- W2904290839 modified "2023-09-22" @default.
- W2904290839 title "New examples of extremal positive linear maps that are not completely positive" @default.
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