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arxiv: 1010.3215 · v2 · pith:FSODXSSCnew · submitted 2010-10-15 · 🧮 math.CV · math.AG

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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