Re: [isabelle-dev] Multiset insert

[Tobias Nipkow]

On 27/07/2016 11:39, Jasmin Blanchette wrote:

Tobias wrote:

Did we ever discuss the naming issue? "insert_mset" would be the canonical 
name, but it would make larger expressions hard to read.

I'm not so sure "insert_mset" would be the right name. Its set-based 
terminology might suggest a definition like

    insert_mset x M = {#x#} #∪ M

You have a point. I didn't even realize that we have #∪.

i.e. with #∪ instead of +. How about "add"?

    add x M = {#x#} + M

Or "add1"? Or "add_mset" etc.?

definition add_mset :: "'a ⇒ 'a multiset ⇒ 'a multiset" ("add#") where
"add# x M = {#x#} + M"

Tobias

I am all in favour of a variation of "add" - it corresponds nicely to "+". Of course not "add" by itself, that is too generic. How about

Jasmin

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