A character's code is a non-negative integer.
The number of places must be a non-negative integer.
(in a stream) a non-negative integer that represents a position in the stream.
valid pathname version n. a non-negative integer, or one of :wild, :newest, :unspecific, or nil.
The file descriptor should be a non-negative integer that is simply used to index into a table of currently-open files by that process.
The value of the userid is either the first argument (if it was a non-negative integer) of the submit call or else it is a positive integer unique only to this ParallelContext.
Otherwise, the result is a non-negative integer, the index within sequence-1 of the leftmost or rightmost position, depending on from-end, at which the two subsequences fail to match.
Because universal time must be a non-negative integer, times before the base time of midnight, January 1 ,1900 GMT cannot be processed by Common Lisp. Figure 25-6.
Diophantus later gives the condition for an integer: the given number must not contain any prime factor of the form 4n + 3 raised to an odd power, where n is a non-negative integer.
A similar problem involves decomposing a given integer into the sum of three squares; in it, Diophantus excludes the impossible case of integers of the form 8n + 7 (again, n is a non-negative integer).
He showed that if q is a prime and q= 12m+5, where m is a non-negative integer, then the self-dual [2q+2,q+1] code over F3 is equivalent to a Pless symmetry code.
