#settheory
Live, measured metrics for the hashtag #settheory from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #settheory
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 2026-10-17 02:00 UTC1 uses by 1 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 2026-10-17 02:00 UTCNo related tags with measured usage found for #settheory.
Live pulse
measured · mastodon.online (Mastodon tag timeline) · fetched 2026-10-17 02:00 UTCEverything below is measured over the latest 40 public posts (spanning ~2345 hours).
Posting hours (UTC) — busiest: 21:00
Languages: English (36) · Russian (2) · German (1)
Avg boosts / post: 1.2
Top of the latest posts
New blog post “Starting to understand epsilon-zero”. A long time ago I said that \( ω^ω \) was the place where the countable ordinals start to get scary, and then about 18 months ago I realized I could think about it in a different way that
New blog post “The road to \( \epsilon_0 \): ordinals as nim-heaps”. I'm starting a series of articles about understanding countable ordinal numbers, with the goal of getting to an understanding of the one called \( \epsilon_0 \). It'll be
After years of mixing up 2·ω (which is equal to ω, and so uninteresting) and ω·2 (which isn't) I have at last thought of a sure way to remember which is which: ω·2 is the one I want, just as ω+2 is, and for the same reason. Sheesh. #ordinal
#settheory across platforms
every network with a public tag surfaceFollow #settheory 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/settheory