Propositional Equality

In the last chapter we learned, how dependent pairs and records can be used to calculate types from values only known at runtime by pattern matching on these values. We will now look at how we can describe relations - or contracts - between values as types, and how we can use values of these types as proofs that the contracts hold.

module Tutorial.Eq

import Data.Either
import Data.HList
import Data.Vect
import Data.String

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