#emptyset
Live, measured metrics for the hashtag #emptyset from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #emptyset
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 · mastodon.online (Mastodon public tags API) · fetched 2026-09-28 14:38 UTC0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · mastodon.online (Mastodon public search API) · fetched 2026-09-28 14:38 UTCLive pulse
measured · mastodon.online (Mastodon tag timeline) · fetched 2026-09-28 14:38 UTCEverything below is measured over the latest 19 public posts (spanning ~36751 hours).
Posting hours (UTC) — busiest: 02:00
Languages: English (13) · Japanese (4) · Dutch (1) · Spanish (1)
Avg boosts / post: 1.6
Top of the latest posts
Evolution of the notation for the empty set: 0 - George Boole 🇬🇧 (1847) 𝑂 - Georg Cantor 🇩🇪 (1880) {} - Gottlob Frege 🇩🇪 (1882) Λ - Giuseppe Peano 🇮🇹 (1889) ∅ - Andre Weil 🇫🇷 (1939) "Much later, my own part in these discussions e
Bristol New Music 2026 @ Various Venues, Bristol - 22 Apr feat. Rian Treanor, claire rousay, Emptyset + more #SESH #RianTreanor #clairerousay #Emptyset https://sesh.sx/e/1709655
CTM x ICA Night 1 @ The Institute of Contemporary Arts London - 04 Sep feat. KAVARI, Emptyset #SESH #KAVARI #Emptyset https://sesh.sx/events/12192472
What “emptyset” means
WikipediaEmptyset is a Bristol-based production project, formed in 2005 by James Ginzburg and Paul Purgas. Ginzburg and Purgas say that by working across performance, installation and the moving image they are examining the physical properties of sound, the legacy of analogue media reflecting upon structural/materialist art production and the perceptual boundaries between noise and music. Emptyset has produced installations for Tate Britain and the Architecture Foundation in London, and presented live pe
“Emptyset” on Wikipedia (CC BY-SA) →#emptyset across platforms
every network with a public tag surfaceFollow #emptyset 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/emptyset