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Showing content from https://lists.gnu.org/archive/html/emacs-devel/2022-11/msg00678.html below:

Re: [PATCH v3] Allow applying filters to summary consecutively

That's okay, thanks. But it's only the beginning of my problem. How do you describe the effect of applying a filter on top of one or more other filters? Andrea wants to use "intersection", but I tend to think this is too "mathematical" and too vague to explain clearly what happens. What would be a good terminology for that?
I think there are two possibilities when adding another filter: either broadening the already existing filtering ("union" in mathematical terms) or narrowing the already existing filtering ("intersection" in mathematical terms).
It's what you call "intersection", obviously.


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