Dr. Bob wonders: what would you call quadrivial?

Umm, lessee, I keep forgetting...arithmetic, geography? astronomy? what's the other one? Common thread here?

Oh, OK, I googled it (yes it is googlable™):

QUADRIVIUM: In the Middle Ages, the higher division of the seven liberal arts, comprising the mathematical sciences (arithmetic, geometry, astronomy, and music).

So, quadrivial would be meaninglessly intricate?

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