Pith Number

pith:NTB2YR4V

pith:2014:NTB2YR4VDSRLKVXYRZZCR2RWGG

not attested not anchored not stored refs pending

The Mesa Problem for the Fractional Porous Medium Equation

Juan Luis V\'azquez

arxiv:1403.4866 v1 · 2014-03-19 · math.AP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NTB2YR4VDSRLKVXYRZZCR2RWGG}

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	2026-05-18T02:56:04.302234Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6cc3ac47951ca2b556f88e7228ea363195e96d7275f65037fa9958dc22145550

Aliases

arxiv: 1403.4866 · arxiv_version: 1403.4866v1 · doi: 10.48550/arxiv.1403.4866 · pith_short_12: NTB2YR4VDSRL · pith_short_16: NTB2YR4VDSRLKVXY · pith_short_8: NTB2YR4V

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/NTB2YR4VDSRLKVXYRZZCR2RWGG \
  | 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: 6cc3ac47951ca2b556f88e7228ea363195e96d7275f65037fa9958dc22145550

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a0859cb2a1d47900924d254cc40f7b5e2d2b84eafef1d3634ef6093e6930196d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2014-03-19T16:09:38Z",
    "title_canon_sha256": "fb617797884075ebce1e7bfd92773b2d31fdafa34de8a6c049f30362c08a8a2d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1403.4866",
    "kind": "arxiv",
    "version": 1
  }
}