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Refactor files about identity types and homotopies (#1014)
The following files were significantly cleaned up: - `foundation.path-algebra` The following files were created: - `foundation.action-on-higher-identifications-functions` - `foundation.whiskering-higher-homotopies` - `foundation.whiskering-identifications` The following other actions were performed: - Adding detailed informal explanations to many entries affected by this pull request. - Replace `whisk` with `whisker` throughout the library. - Making the order of arguments uniform for various operations on commuting squares and triangles of identifications. - Fixing names so that operator names go before the entity that they act on: * `htpy-left-whisker` to `htpy-left-whisker` * `coherence-square-identifications-horizontal-inv` to `horizontal-inv-coherence-square-identifications` * `coherence-square-identifications-left-paste` to `left-concat-identification-coherence-square-identification`, and variants - Replace `ap (ap f)` with `ap² f` throughout the library. I also renamed the various `nat-sq`-entries about `ap²`. - Moving the entries about squares of identifications from `path-algebra` to `commuting-squares-of-identifications`. - There were duplicate entries that did the same pasting lemmas of commuting squares of identifications, spread out over several files including `commuting-squares-of-identifications` and `path-algebra`. These separate formalization attempts have been unified. - Removing "iterated inverse laws" from `path-algebra` since they were duplicate entries and they were not actually iterated. - Rename `ap-concat-eq` to `map-coherence-triangle-identifications`, change the order of its arguments to match with `coherence-triangle-identifications`, and move it to `commuting-triangles-of-identifications`. - Rename `coherence-square-identifications-ap` to `map-coherence-square-identifications`. - Remove entries `inv-htpy-left-whisk-inv-htpy` and `inv-htpy-right-whisk-inv-htpy`. - Rename `ap-left-whisk-htpy` to `left-whisker-htpy²`, and `ap-right-whisk-htpy` to `right-whisker-htpy²` and move them to `whiskering-higher-homotopies`. - Correcting a statement that `refl-htpy` is a unit element on the homotopy side for whiskering. Instead, it is an absorbing element. --------- Co-authored-by: Fredrik Bakke <fredrbak@gmail.com>
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