TY  - JOUR
AU  - Fernando Galván, José Francisco
AU  - Ruiz Sancho, Jesús María
AU  - Scheiderer, Claus
PY  - 2006
SN  - 1073-2780
UR  - https://hdl.handle.net/20.500.14352/49900
T2  - Mathematical Research Letters
AB  - Let k be a real field. We show that every non-negative homogeneous quadratic polynomial f (x(1),..., x(n)) with coefficients in the polynomial ring k[t] is a sum of 2n center dot tau(k) squares of linear forms, where tau(k) is the supremum of the...
LA  - spa
M2  - 947
PB  - International Press
KW  - Sums of squares
KW  - quadratic forms
KW  - level
KW  - Pythagoras numbers
KW  - local henselian rings.
TI  - Sums of squares of linear forms
TY  - journal article
VL  - 13
ER  -