Cats
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src/content/_templates/_post.md
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title: Title
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date: {{date:YYYY-MM-DDTHH:mm:ssZ}}
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---
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src/content/posts/category-theory.md
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---
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title: Category theory, abstract algebra and friends
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date: 2023-05-14T21:57:54+02:00
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---
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## Monoid
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$$
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(M, *)
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$$
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```haskell
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class Monoid a where
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mempty :: a
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mappend :: a -> a -> a
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```
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