Pith Number

pith:UT4YUPMI

pith:2017:UT4YUPMIUYQRKX3WTTMJ36T2O7

not attested not anchored not stored refs pending

A free-boundary problem with moving contact points

Ivan Fumagalli

arxiv:1707.00129 v1 · 2017-07-01 · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UT4YUPMIUYQRKX3WTTMJ36T2O7}

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	2026-05-18T00:41:06.388421Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a4f98a3d88a621155f769cd89dfa7a77e7c93cc780cffaf00e9da7b6a41c0bd7

Aliases

arxiv: 1707.00129 · arxiv_version: 1707.00129v1 · doi: 10.48550/arxiv.1707.00129 · pith_short_12: UT4YUPMIUYQR · pith_short_16: UT4YUPMIUYQRKX3W · pith_short_8: UT4YUPMI

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/UT4YUPMIUYQRKX3WTTMJ36T2O7 \
  | 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: a4f98a3d88a621155f769cd89dfa7a77e7c93cc780cffaf00e9da7b6a41c0bd7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5b173f897daee9cae2100dabeb1c0be0a2cb1e00426d18e3b81d241db42153ab",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2017-07-01T09:52:59Z",
    "title_canon_sha256": "a03764d67e9cb1f09d462df510b71b68e9c6cf8ec91d61ed4fc3dc1e12944d3a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1707.00129",
    "kind": "arxiv",
    "version": 1
  }
}