Set - Set -- set difference

Set - Set -- set difference

Synopsis:

Operator: - -- a unary or binary operator, usually used for negation or subtraction

Input:

an instance of class Set.

Output:

an instance of class Set.

Next more general method: Tally - Tally -- difference of tallies

x - y -- the difference of two sets.

See also:

Set -- the class of all sets

- -- a unary or binary operator, usually used for negation or subtraction

Code:

     -- ../../../Macaulay2/m2/set.m2:52
     Set - Set := Set => (x,y) -> applyPairs(x, (i,v) -> if not y#?i then (i,v))