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https://archive.org/details/theoryofselfrepr00vonn_0/page/10... has a shout out (bottom of page) to one of my favourite papers: https://www.rand.org/content/dam/rand/pubs/research_memorand...

Having missed its 64th anniversary, I guess I should plan to get a working implementation of my kleene algebra (quantale) in shape for its 75th?