progs/app60.scala
author cu
Tue, 03 Oct 2017 23:01:06 +0100
changeset 512 a6aa52ecc1c5
parent 435 e08431a78f66
permissions -rw-r--r--
updated

def ders(s: List[Char], r: Rexp) : Rexp = s match {
  case Nil => r
  case c::s => ders(s, simp(der(c, r)))          
}