object SetApp extends App with ScalaTion
{
  val set1 = Set(1, 2, 3, 4)
  val set2 = Set(1.0, 2.0, 3.0, 4.0)

  val setTest1 = 2 ∈ set1 // true
  val setTest2 = 5 ∈ set1 // false
  val setTest3 = 2.0 ∈ set2 // true

  println("set1     = %s".format(set1))
  println("set2     = %s".format(set2))
  println("2 ∈ set1 = %s".format(setTest1))
  println("5 ∈ set1 = %s".format(setTest2))
  println("2 ∈ set2 = %s".format(setTest3))
}