Zero One Infinity Rule  "Allow none of foo, one of foo, or any
number of foo. ... The logic behind this rule is that there are
often situations where it makes clear sense to allow one of
something instead of none. However, if one decides to go further
and allow N (for N > 1), then why not N+1? And if N+1, then why
not N+2, and so on? Once above 1, there's no excuse not to allow
any N; hence, infinity." -- From the JargonFile, at <>  This
rule is due to early Dutch computer pioneer Professor
WillemLouisVanDerPoel (designed early computers Testudo 1949,
Zebra 1952); I don't know why the jargon file doesn't reflect
this. -- DougMerritt  Is Professor WillemLouisVanDerPoel's work
older than Wang's paradox? -- EpistrophyAdebiyi?  "The only
reasonable numbers are zero, one and infinity." --
BruceMacLennan, Principles of Programming Languages (1987) (ISBN
0030617111 or ISBN 0195105834 )  See also <>.  Zero-one-infinity
is a design rule-of-thumb that is often ignored - usually to the
detriment of the project.  Simply