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[Merged by Bors] - feat: images of intervals under (↑) : ℕ → ℤ
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Also use them for `Rat.cast`.
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bors d+
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Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
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Also generalize `IsUpperSet.Ioi_subset` and `IsLowerSet.Iio_subset` from a `PartialOrder` to a `Preorder`.
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feat: images of intervals under
[Merged by Bors] - feat: images of intervals under Jan 30, 2024
(↑) : ℕ → ℤ
(↑) : ℕ → ℤ
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Also generalize
IsUpperSet.Ioi_subset
andIsLowerSet.Iio_subset
from a
PartialOrder
to aPreorder
.