Given a homogeneous polynomial f(x1,x2,...,xn)ε
R[x1,x2,..,xn] of degree 2,
then f=y1^2+..+yt^2-yt+1^2-yt+2^2...-yt+s^2 by some
linear change of variables from {xi} to {yi}
以上是96年度台大博班代數考題
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