Lei de inércia de Sylvester (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Lei de inércia de Sylvester" in Portuguese language version.

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doi.org

dx.doi.org

Sylvester, J J (1852). «A demonstration of the theorem that every homogeneous quadratic polynomial is reducible by real orthogonal substitutions to the form of a sum of positive and negative squares» (PDF). Philosophical Magazine (Ser. 4). 4 (23): 138–142. doi:10.1080/14786445208647087. Consultado em 27 de junho de 2008

ed.ac.uk

maths.ed.ac.uk

Sylvester, J J (1852). «A demonstration of the theorem that every homogeneous quadratic polynomial is reducible by real orthogonal substitutions to the form of a sum of positive and negative squares» (PDF). Philosophical Magazine (Ser. 4). 4 (23): 138–142. doi:10.1080/14786445208647087. Consultado em 27 de junho de 2008