[isabelle-dev] New lemmas about count_list

[Martin Desharnais]

Dear Tobias,

thanks for looking into it.

> Thus I would rather not create a growing count_list library, if it can 
> be avoided. Could you try to use the above hint and go via multisets? (I 
> may add one or two of your lemmas anyway, as a compromise)

I will try to replace all my usages of count_list by "count ∘ mset" and 
see how things turn out.

Cheers,
Martin
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