The Econometric SocietyEconometrica: Apr 1952, Volume 20, Issue 2
Definite and Semidefinite Quadratic Forms
https://doi.org/0012-9682(195204)20:2<295:DASQF>2.0.CO;2-0
p.
295-300
Gerard Debreu
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p.
295-300
Gerard Debreu