#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 · mas.to (Mastodon public tags API) · fetched 2026-10-15 08:50 UTC0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · mas.to (Mastodon public search API) · fetched 2026-10-15 08:50 UTCLive pulse
measured · mas.to (Mastodon tag timeline) · fetched 2026-10-15 08:50 UTCEverything below is measured over the latest 8 public posts (spanning ~29556 hours).
Posting hours (UTC)
Languages: English (6) · Russian (1) · Lithuanian (1)
Avg boosts / post: 4.1
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
Something a little different today on the channel: HyperLogLog! It's one of my favorite algorithms, used to estimate cardinality of a set. Typically used in environments with very large datasets (spread across many servers in a cluster) whe
Prometheus и VictoriaMetrics: почему одни и те же метрики могут занимать в 139 раз больше места Меня зовут Стас Погоржельский, я технологический евангелист VK Cloud и последние месяцы гоняю Prometheus и VictoriaMetrics на одном стенде, чтоб
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