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akhileshs/YC.scala

Created December 11, 2015 18:56
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YC.scala
scala> case class B[F, T](c: B[F, T] => (F => T)) extends (B[F, T] => (F => T)) {
| def apply(b: B[F, T]) = c(b);
| }
defined class B
scala> def Y[F, T] = (f: (F => T) => F => T) =>
| B[F, T](x => f(x(x)(_)))(B(x => f(x(x)(_))))
Y: [F, T]=> ((F => T) => (F => T)) => (F => T)
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