I am looking at the following mathematica code
Subscript[ff, r1_, r2_, CC_][x_, y_] := (r1 x + r2 y) (1 - (x + y)/CC) Subscript[gg, r1_, r2_, CC_][x_, y_] := x
and am wondering why the $r1,r2,CC$ variables are written as subscripts instead of being included as 's. What does putting a variable as subscript do? I tried looking for this information here but didn't find my answer.