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Re: Matrix Form of Quadratic Equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg114250] Re: Matrix Form of Quadratic Equations
  • From: "gianpf" <jean.pellegri at orange.fr>
  • Date: Sun, 28 Nov 2010 06:56:13 -0500 (EST)
  • References: <ico2b2$nq6$1@smc.vnet.net>

Salut

Resolve[ForAll[{x, y}, {x, y}.{{a, b}, {b, d}}.{x, y} == x^2 + y^2 - 2 x y],
Reals]

a == 1 && b == -1 && d == 1




"Ari" <arifin at finly.net> a =E9crit dans le message de
news:ico2b2$nq6$1 at smc.vnet.net...
> Hello,
>
> Could anyone guide me how to build a mathematica module to form a Matrix
> form from a quadratic equations?
> For example, x^2 + y^2 - 2 x y will output
> {{1, -1}, {-1, 1}} ?
>
> Thanks
>



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