Undefined
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See: Undefined Value (Undefined Number), Unlabeled.
References
1996
- (Wall et al., 1996) ⇒ Larry Wall, Tom Christiansen, and Randal L. Schwartz. (1996). “Programming Perl, 2nd edition." O'Reilly. ISBN:1565921496
- undefined: Nobody has ever given this a reasonable definition. See also defined.