apply(Set,Function)

apply(x,f) -- apply a function f to each element of a Set x , producing a new set.

     i1 = x = set {1,2,3}
     
     o1 = set {1, 2, 3}
     
     o1 : Set

     i2 = apply(x,x -> x^2)
     
     o2 = set {4, 9, 1}
     
     o2 : Set