Re: Quantum Gravity 178.2: Einstein's c Overruled By Causal Hessian on fxxfyy - fxy^2


"OsherD" <mdoctorow@xxxxxxxxx> wrote in message
news:1190353321.700556.249880@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
From Osher Doctorow

We know from the second partial derivative test for maxima and minima
of functions of two variables f(x, y) that:

1) f(a, b) is not an extremum if fxxfyy - (fxy)^2 < 0


what is an "fxxfyy" ?


.

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