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All of this is still needed, 10 years later. I at least just expanded the lead section with a number of the most basic concepts/definitions, but this topic could really fill a whole book (and has). I'm busy with some other projects, but I'll try to come flesh it out some more (with proper sourcing, etc.) at some point. –jacobolus(t)19:29, 22 July 2023 (UTC)