[Merged by Bors] - feat(data/set/intervals/image_preimage): new file #2958
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* Create a file for lemmas like `(λ x, x + a) '' Icc b c = Icc (b + a) (b + c)`. * Prove lemmas about images and preimages of all intervals under `x ↦ x ± a`, `x ↦ a ± x`, and `x ↦ -x`. * Move lemmas about multiplication from `basic`.
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* Create a file for lemmas like `(λ x, x + a) '' Icc b c = Icc (b + a) (b + c)`. * Prove lemmas about images and preimages of all intervals under `x ↦ x ± a`, `x ↦ a ± x`, and `x ↦ -x`. * Move lemmas about multiplication from `basic`.
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…ity#2958) * Create a file for lemmas like `(λ x, x + a) '' Icc b c = Icc (b + a) (b + c)`. * Prove lemmas about images and preimages of all intervals under `x ↦ x ± a`, `x ↦ a ± x`, and `x ↦ -x`. * Move lemmas about multiplication from `basic`.
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(λ x, x + a) '' Icc b c = Icc (b + a) (b + c).x ↦ x ± a,x ↦ a ± x, andx ↦ -x.basic.