Wrote a new chapter of the Category Theory book - Orders.

This is just part one, part two is coming soon(ish).

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@borko Just a quick remark: your definition of a maximum is different from the one that is usually used in mathematics: Usually, an element is called a maximum if there exst no strictly larger element. So in the given example, both the red element and the green element would be considered maxima. (In a lattice, both concepts of a maximum agree.)

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