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Plotting iso-distance curves from matrices


Hi,

I would like to plot iso-distance curves (in 2 dimensions) satisfying
the following condition:

{ x \in R^2 | (x-x_0)^T A (x-x_0) = d^2}

with x a 2x1 vector, ^T denoting the transposed sign and A a positive
definite matrix. Any way to do it in Mathematica?

Uwe


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