#Lean4

Live, measured metrics for the hashtag #Lean4 from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.

hashtag.org network · sponsored

Own #lean4

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.

$1,129.43/ year · 5-character #name
Claim #lean4 — $1,129.43/yr→Buy on hashtag.space (web3)
card via hashtag.org · tokens via hashtag.space
2
Uses / 7 days
Mastodon
2
Accounts / 7 days
Mastodon
40
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 40
0.6
Avg reactions / post
Mastodon · last 40

Day-by-day usage

measured · fosstodon.org (Mastodon public tags API) · fetched 2026-07-27 18:09 UTC
1
07-21
0
07-22
0
07-23
0
07-24
1
07-25
0
07-26
0
07-27

2 uses by 2 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 2026-07-27 18:09 UTC
#lean_4
0 uses · 0 accounts / 7d
#lean4statemachines
0 uses · 0 accounts / 7d

Live pulse

measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-07-27 18:09 UTC

Everything below is measured over the latest 40 public posts (spanning ~5615 hours).

Posting hours (UTC) — busiest: 01:00

00:0012:0023:00

Languages: English (38) · Catalan (1) · Russian (1)

Avg boosts / post: 0.6

Top of the latest posts

  • having a bunch of fun with #lean4 they got me to do maths with it and have fun, and now i somewhat want to learn more mathematics. talk to your children about theorem provers before some dependent types dealer gets to them first :p

    systemd-jaded.timer@[email protected]♥ 10↻ 22026-01-13 06:14 UTCView post →

  • Advent of Code 2025 in Lean 4, day 12: https://hamberg.no/erlend/posts/2025-12-31-aoc-2025-day-12.html “Parsing and panic” – in which I panic when facing a difficult problem and just…get away with it? I did it! I completed Advent of Code 20

    eh@[email protected]♥ 5↻ 12025-12-31 16:32 UTCView post →

  • @gallais as someone coming from a community where people are doing this, the answer is sadly an emphatic yes. People don’t care about formalisation as research or even serious mathematical work. They really just want to take the handwritten

    NoCanDo@[email protected]♥ 3↻ 22026-07-27 11:46 UTCView post →

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/lean4