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!).

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!).