The following in F# :

Set difference, R - S, is all tuples in R but not in S. For example: let R-IS ((3333, "COMP"); (3333, "HIST); (3333, "PHYS ) 2 let S-IS ((3333, "COMP) (3333, "BIOL )]: 4 I/R -S IS [(3333, "HIST"); (3333, "PHYS" Define the difference operation for SI and SIIS sets for the test below 1let i1 I [1111;2222;3333]; 21 let i2 1 [5555; 6666];; let si -S "COMP" "HIST" "PHYS": 4 let s2 S [" CHEM"; "MATH"];; let is product i1 sl; 7 1et si1 - product s1 i1; s let si2 product s2 12;; let sisi - product si1 si2;; 10 let siisi product si1 is;; 11let siis2 product si2 is;; 13 difference sil si2 14 difference siisl siis2