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On Wed, Jun 15, 2011 at 9:42 PM, Xavier Wang <> wrote:
>> The length of a table t is only defined if the table is a sequence, that is,
>> all its numeric keys comprise the set {1..n} for some integer n.
> is that mean, a empty table ({}) has no length defined?

Maybe say "non-negative integer n".  IMO, {1..0} == {}.