For multisets, add extra pair of (), see https://tex.stackexchange.com/questions/5816/multiset-notation-in-latex

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@ccppurcell well, double vs single pair of brackets is nothing unsual, one e.g. does \(k[[x]]\) for the ring of formal power series in \(x\) over \(k\)

Chris Purcell@ccppurcell@mathstodon.xyz@dimpase well bra-ket notation in quantum physics is no longer unusual (in the frequency sense) but I don't have to like it!