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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | \DOC subtract
\TYPE {subtract : (* list -> * list -> * list)}
\SYNOPSIS
Computes the set-theoretic difference of two `sets'.
\KEYWORDS
list, set.
\DESCRIBE
{subtract l1 l2} returns a list consisting of those elements of {l1} that do
not appear in {l2}.
\FAILURE
Never fails.
\EXAMPLE
{
#subtract [1;2;3] [3;5;4;1];;
[2] : int list
#subtract [1;2;4;1] [4;5];;
[1; 2; 1] : int list
}
\SEEALSO
setify, set_equal, union, intersect.
\ENDDOC
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