#clopen
Live, measured metrics for the hashtag #clopen from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #clopen
This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.
Day-by-day usage
measured · fosstodon.org (Mastodon public tags API) · fetched 2026-08-12 10:40 UTC0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · fosstodon.org (Mastodon public search API) · fetched 2026-08-12 10:40 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-08-12 10:40 UTCEverything below is measured over the latest 1 public posts.
Posting hours (UTC)
Languages: English (1)
Avg boosts / post: 0
Used together with
Top of the latest posts
@gwynnion in #maths sets can be open or closed. Or neither. Or both (we call those "clopen") #math #topology #clopen
What “clopen” means
WikipediaIn topology, a clopen set in a topological space is a set which is both open and closed. That this is possible may seem counterintuitive, as the common meanings of open and closed are antonyms, but their mathematical definitions are not mutually exclusive. A set is closed if its complement is open, which leaves the possibility of an open set whose complement is also open, making both sets both open and closed, and therefore clopen. As described by topologist James Munkres, unlike a door, "a set
“Clopen set” on Wikipedia (CC BY-SA) →#clopen across platforms
every network with a public tag surfaceFollow #clopen straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.
Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/clopen