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chore(topology): generalize
real.image_Icc
etc (#9784)
* add lemmas about `Ici`/`Iic`/`Icc` in `α × β`; * introduce a typeclass for `is_compact_Icc` so that the same lemma works for `ℝ` and `ℝⁿ`; * generalize `real.image_Icc` etc to a conditionally complete linear order (e.g., now it works for `nnreal`, `ennreal`, `ereal`), move these lemmas to the `continuous_on` namespace.
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