(Well, sort of. The minimax and maximax principles require only that we measure value on an ordinal scale, whereas the optimism-pessimism rule requires that we measure value on an interval scale.)

I'm using this as an introduction to decision theory so I might be wrong, and I've read that 'maximin' and 'minimax' do have different meanings in game theory, but you exclusively use the term 'maximin' up to a certain point and then mention a 'minimax principle' once, so I can only imagine that you meant to write 'maximin principle.' It confused me. It's probably best to stick with one or the other.

Also, thanks for the introduction.

ETA: I found a typo.

Usually, it is argued that each of the axioms are pragmatically justified because an agent which violates the axioms can face situations in which they are guaranteed end up worse off (from their own perspective).

should be:

Usually, it is argued that each of the axioms are pragmatically justified because an agent which violates the axioms can face situations in which they are guaranteed to end up worse off (from their own perspective).