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Is this a bug


Clear[f]
f[x_] := x^2 + 1 /; x >= O
f[x_] := -x^2 - 1 /; x < O
Plot[f[x], {x, -2, 2}]

Above f is a piecewise function.But Plot can't plot the function. Why?
MY MATHEMATICA is version 6.
can the piecewise function be defined like this?


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