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Numerics seem to always have gotchas lurking in the bushes, so one needs to be very careful about making global changes to the way numerics are done. To satisfy your requirements, I would probably put the following code in a initialization cell. $myPrecision = 25; myN[x_] := N[x, $myPrecision] myP[x_] := SetPrecision[x, $myPrecision] Of course, you would ...

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