Pith Number

pith:4QIC4YTK

pith:2014:4QIC4YTKCPYIBVWCPSALAFMNB7

not attested not anchored not stored refs pending

On a question of R.H. Bing concerning the fixed point property for two-dimensional polyhedra

Iv\'an Sadofschi Costa, Jonathan Ariel Barmak

arxiv:1412.8737 v1 · 2014-12-30 · math.AT

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4QIC4YTKCPYIBVWCPSALAFMNB7}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T02:30:16.647232Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e4102e626a13f080d6c27c80b0158d0fff16029195fa12a6d3cd2035f32a8dcb

Aliases

arxiv: 1412.8737 · arxiv_version: 1412.8737v1 · doi: 10.48550/arxiv.1412.8737 · pith_short_12: 4QIC4YTKCPYI · pith_short_16: 4QIC4YTKCPYIBVWC · pith_short_8: 4QIC4YTK

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/4QIC4YTKCPYIBVWCPSALAFMNB7 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: e4102e626a13f080d6c27c80b0158d0fff16029195fa12a6d3cd2035f32a8dcb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "65d419eb23354d61000617347c4f0418f708c65cfc866f769e3b5405ea9283f8",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2014-12-30T19:20:08Z",
    "title_canon_sha256": "7f2707c08f4f96de5120b10c7e6c902fe4b6ba87c1ea69f852fc434d3bee281b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1412.8737",
    "kind": "arxiv",
    "version": 1
  }
}