#undecidability

Live, measured metrics for the hashtag #undecidability 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 #undecidability

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.

$5.00/ year · 14-character #name
Claim #undecidability — $5.00/yr→Buy on hashtag.space (web3)
card via hashtag.org · tokens via hashtag.space
0
Uses / 7 days
Mastodon
0
Accounts / 7 days
Mastodon
6
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 6
0
Avg reactions / post
Mastodon · last 6

Day-by-day usage

measured · fosstodon.org (Mastodon public tags API) · fetched 2026-07-27 15:27 UTC
0
07-21
0
07-22
0
07-23
0
07-24
0
07-25
0
07-26
0
07-27

0 uses by 0 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 15:27 UTC
#undecidability_of_equivalence
0 uses · 0 accounts / 7d

Live pulse

measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-07-27 15:27 UTC

Everything below is measured over the latest 6 public posts (spanning ~28501 hours).

Posting hours (UTC)

00:0012:0023:00

Languages: English (6)

Avg boosts / post: 0.3

Top of the latest posts

  • I Caught the Car https://undecidability.net/senior/ #HackerNews #CaughtTheCar #CarStory #HackerNews #TechTales #Undecidability

    Hacker News@[email protected]♥ 0↻ 02026-05-09 20:56 UTCView post →

  • Typechecking is undecideable when 'type' is a type (1989) [pdf] https://dspace.mit.edu/bitstream/handle/1721.1/149366/MIT-LCS-TR-458.pdf #HackerNews #Typechecking #undecidability #type #theory #1989 #MIT #research #pdf

    Hacker News@[email protected]♥ 0↻ 02025-11-23 16:34 UTCView post →

  • Undecidability is a feature of physical theories and cannot literally exist in real experiments. Only idealized systems that involve infinity —an infinitely long tape, an infinitely extensive grid of particles, an infinitely divisible space

    Chuck Darwin@[email protected]♥ 0↻ 02025-04-12 18:12 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/undecidability