A confluent non-idempotent intersection type system for lambda-calculus induces a factorization of derivation spaces into garbage-free prefixes and garbage using a variant of the Grothendieck construction.
Note that t and yα 2 have the same type, namely α 2, but they do not occur at disjoint positions
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Factoring Derivation Spaces via Intersection Types (Extended Version)
A confluent non-idempotent intersection type system for lambda-calculus induces a factorization of derivation spaces into garbage-free prefixes and garbage using a variant of the Grothendieck construction.