  Higher Type Arithmetic (HA$^w$) is a first-order many-sorted theory. It is a
conservative extension of Heyting Arithmetic obtained by extending the syntax
of terms to all of System T: the objects of interest here are the functionals
of higher types. While equality between natural numbers is specified by the
axioms of Peano, how can equality between functionals be defined? From this
question, different versions of HA$^w$ arise, such as an extensional version
(E-HA$^w$) and an intentional version (I-HA$^w$). In this work, we will see how
the study of partial equivalence relations leads us to design a translation by
parametricity from E-HA$^w$ to HA$^w$.
