2008/08/28 by Parimala, R., Suresh, V., Tignol, J. -P.
#FOS: Mathematics #Rings and Algebras (math.RA)
paper · doi:10.48550/arxiv.0808.3840
The generic quadratic form of even dimension n with trivial discriminant over an arbitrary field of characteristic different from 2 containing a square root of -1 can be written in the Witt ring as a sum of 2-fold Pfister forms using n-2 terms and not less. The number of 2-fold Pfister forms needed to express a quadratic form of dimension 6 with trivial discriminant is determined in various cases.