> but this leads to the rather lengthy "insert_mset x M" as opposed to the 
> current "{#x#} + M". This would come up in all inductive proofs. If we want 
> to mimic sets, it actually seems unavoidable...

With completion, it might actually be easier to type "insert_mset x M" than 
"{#x#} + M". (The former is visually longer, for sure.)

Jasmin

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