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FilledSmallSquare $VersionNumber is a real number which gives the current Mathematica kernel version number, and increases in successive versions.

FilledSmallSquare To find out if you are running under Version 5 or above, you can use the test TrueQ[$VersionNumber >= 5.0].

FilledSmallSquare A version with a particular number is typically derived from the same source code on all computer systems.

FilledSmallSquare See Section 2.14.5.

FilledSmallSquare See also: $ReleaseNumber.

FilledSmallSquare New in Version 2.