“What are we thinking when we present a type theory?” by Peter LeFanu Lumsdaine: youtube.com/watch?v=kQe0kn
I found the clarification of some of the hidden rules you have in your head when reading type theories really interesting and worthwhile!
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Also found the observation that the order in which the rules for dependent pairs and dependent functions are defined shouldn't really matter (44:56) interesting too. Links in with some of the graph/module stuff I've been pondering recently…
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