unit = terminal object = () = in [[SET Category]], set with one element = in logic, proving \"true\"

unit = terminal object = () = in SET Category, set with one element = in logic, proving “true”

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terminal object = from every point in a category, there is one and only one arrow to the terminal object

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two terminal objects are always have a uniquely ismorphic = only one way to isomorph between the two

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you can return a unit from anything, a -> ()

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can use unit to define the element of a set, one :: () -> int, two :: () -> int

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as many unit -> t functions exist as elements in the type t

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instead of talking about elements in category theory, we can talk about the function from unit

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Ideas from [[Category Theory]]