Commit 2021-07-13 12:28 3e56439d
View on Github →chore(data/set/intervals): relax linear_order to preorder in the proofs of Ixx_eq_empty_iff
(#8071)
The previous formulations of Ixx_eq_empty(_iff)
are basically a chaining of this formulation plus not_lt
or not_le
. But not_lt
and not_le
require linear_order
. Removing them allows relaxing the typeclasses assumptions on Ixx_eq_empty_iff
and slightly generalising Ixx_eq_empty
.