The Integers as a Higher Inductive Type
The Integers as a Higher Inductive Type
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整数作为更高归纳类型
DOI:
10.1145/3373718.3394760
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Altenkirch T
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文献类型:
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作者:
Altenkirch T
We consider the problem of defining the integers in Homotopy Type Theory (HoTT). We can define the type of integers as signed natural numbers (i.e., using a coproduct), but its induction principle is very inconvenient to work with, since it leads to an explosion of cases. An alternative is to use set-quotients, but here we need to use set-truncation to avoid non-trivial higher equalities. This results in a recursion principle that only allows us to define function into sets (types satisfying UIP). In this paper we consider higher inductive types using either a small universe or bi-invertible maps. These types represent integers without explicit set-truncation that are equivalent to the usual coproduct representation. This is an interesting example since it shows how some coherence problems can be handled in HoTT. We discuss some open questions triggered by this work. The proofs have been formally verified using cubical Agda.
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DOI:
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