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Challenge: isIn

Submitted by: Violeta Hernández Palacios

Submitted at: 2024-11-19 09:39:54

Code:

def isIn (x:Int) (xs: List Int):Bool

:= xs.contains x

First Theorem Proof:

def isIn_correct (x:Int)(xs:List Int):
  isIn x xs = true ↔ x∈ xs

:= by simp [isIn]

Status: Correct

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