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$SameQTolerance gives the number of decimal digits by which two numbers can disagree and still be considered the same according to SameQ.
The default setting is equal to Log[10, 2], corresponding to a tolerance of one binary digit.
See also: $MachineEpsilon.
Note: this is an experimental feature, and in future versions of Mathematica it may not be supported, or may have a different specification.
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