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$MinPrecision
$MinPrecision gives the minimum number of digits of precision to be allowed in arbitrary-precision numbers.
The default value of $MinPrecision is 0.
Positive values of $MinPrecision make Mathematica pad arbitrary-precision numbers with zero digits to achieve the specified nominal precision. The zero digits are taken to be in base 2, and may not correspond to zeros in base 10.
$MaxPrecision
=
$MinPrecision
=
n makes Mathematica do fixed-precision arithmetic.
$MinPrecision is measured in decimal digits, and need not be an integer.
