Pfister's theorem fails in the Hermitian case
classification
🧮 math.CV
math.AG
keywords
hermitianfailspfistersquaresanaloguecannotcasedegree
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We show that the Hermitian analogue of a famous result of Pfister fails. To do so we provide a Hermitian symmetric polynomial $r$ of total degree 2d such that any non-zero multiple of it cannot be written as a Hermitian sum of squares with fewer than $d+1$ squares.
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