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      Rota and Baclawski’s book on probability may also be interesting for lobste.rs - pdf made available by David Ellerman here. They introduce multisets in chapter one (1.11) and use them to look at Bose-Einstein statistics (2.21) using ‘multiset coefficients’ which have some cool analogies with binomial coefficients (2.25). I think of multisets as more of a programming thing so it’s interesting for me seeing them in maths (maybe this just reflects my inexperience in both!).