#cardinality
Live, measured metrics for the hashtag #cardinality from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #cardinality
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 2026-10-23 23:03 UTC1 uses by 1 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 2026-10-23 23:03 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-10-23 23:03 UTCEverything below is measured over the latest 13 public posts (spanning ~48215 hours).
Posting hours (UTC) — busiest: 14:00
Languages: English (12) · Russian (1)
Avg boosts / post: 2.5
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
Just released: Discrete Math Cheat Sheet by AviMathPerson Download it free at http://www.cheatography.com/avimathperson/cheat-sheets/discrete-math/?utm_source=mastodon Here's their description of it: Notes from a course I took in discrete m
🚀 VictoriaMetrics September Product Updates are here, and this is what #vmestimator 0.1.16 provides: 📊 New churn ratio and churn interval metrics 📈 Improved #Cardinality Estimations dashboard Explore the new features and learn how to get
What “cardinality” means
Wiktionary · WikipediaIn mathematics, cardinality is an inherent property of sets, roughly meaning the number of individual objects they contain, which may be infinite. The concept is understood through one-to-one correspondences between sets. That is, if their objects can be paired such that each object has a pair, and no object is paired more than once.
“Cardinality” on Wikipedia (CC BY-SA) →#cardinality across platforms
every network with a public tag surfaceFollow #cardinality 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/cardinality