[Merged by Bors] - feat: Add a few continuity lemmas for products #10820
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1. `ContinuousAt.comp₂`, `ContinuousAt.comp₂_continuousWithinAt`, and
`_of_eq` version.
2. `ContinuousAt.along_{fst,snd}` that continuous functions are
continuous in their first and second arguments.
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Also rename `continuous_uncurry_{left,right}` to `Continuous.uncurry_*`.
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Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
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1. `ContinuousAt.comp₂`, `ContinuousAt.comp₂_continuousWithinAt`, and `_of_eq` versions.
2. `ContinuousAt.along_{fst,snd}`: Continuous functions are continuous in their first and second arguments.
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kbuzzard
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1. `ContinuousAt.comp₂`, `ContinuousAt.comp₂_continuousWithinAt`, and `_of_eq` versions.
2. `ContinuousAt.along_{fst,snd}`: Continuous functions are continuous in their first and second arguments.
dagurtomas
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Mar 22, 2024
1. `ContinuousAt.comp₂`, `ContinuousAt.comp₂_continuousWithinAt`, and `_of_eq` versions.
2. `ContinuousAt.along_{fst,snd}`: Continuous functions are continuous in their first and second arguments.
utensil
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Mar 26, 2024
1. `ContinuousAt.comp₂`, `ContinuousAt.comp₂_continuousWithinAt`, and `_of_eq` versions.
2. `ContinuousAt.along_{fst,snd}`: Continuous functions are continuous in their first and second arguments.
Louddy
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Apr 15, 2024
1. `ContinuousAt.comp₂`, `ContinuousAt.comp₂_continuousWithinAt`, and `_of_eq` versions.
2. `ContinuousAt.along_{fst,snd}`: Continuous functions are continuous in their first and second arguments.
uniwuni
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Apr 19, 2024
1. `ContinuousAt.comp₂`, `ContinuousAt.comp₂_continuousWithinAt`, and `_of_eq` versions.
2. `ContinuousAt.along_{fst,snd}`: Continuous functions are continuous in their first and second arguments.
callesonne
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Apr 22, 2024
1. `ContinuousAt.comp₂`, `ContinuousAt.comp₂_continuousWithinAt`, and `_of_eq` versions.
2. `ContinuousAt.along_{fst,snd}`: Continuous functions are continuous in their first and second arguments.
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ContinuousAt.comp₂,ContinuousAt.comp₂_continuousWithinAt, and_of_eqversions.ContinuousAt.along_{fst,snd}: Continuous functions are continuous in their first and second arguments.