progs/app60.scala
author Christian Urban <urbanc@in.tum.de>
Fri, 28 Sep 2018 13:54:18 +0100
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def ders(s: List[Char], r: Rexp) : Rexp = s match {
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  case Nil => r
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  case c::s => ders(s, simp(der(c, r)))          
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}