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

[Eli Zaretskii]

> Date: Fri, 11 Nov 2022 18:52:28 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: rms@gnu.org, andrea.monaco@autistici.org, rpluim@gmail.com, 
>     emacs-devel@gnu.org
> 
> Yes, my point was to mention the two less mathematical words: broadening 
> and narrowing.

Narrowing is already being used, but it needs explanation, being a
general notion.  I was looking for a single word or max 2 words,

> That being said, I don't user Rmail but I don't think it obvious that 
> filtering is always "intersection".  Someone may filter their inbox to see 
> mails from Alice, and add mails from Alice to the filtering.

You could read about it in the manual.  It doesn't make a lot of sense
to suggest terminology for features you are not familiar with.