Pith Number

pith:NN2UPGNA

pith:2019:NN2UPGNAQUQCKWFQSWDIKHPDPA

not attested not anchored not stored refs pending

Recovering the initial condition of parabolic equations from lateral Cauchy data via the quasi-reversibility method

Loc H. Nguyen, Qitong Li

arxiv:1902.07637 v2 · 2019-02-20 · 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{NN2UPGNAQUQCKWFQSWDIKHPDPA}

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	2026-05-17T23:41:21.800921Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6b754799a085202558b09586851de37830fa0f5ea5b48e9a06246bededaf710b

Aliases

arxiv: 1902.07637 · arxiv_version: 1902.07637v2 · doi: 10.48550/arxiv.1902.07637 · pith_short_12: NN2UPGNAQUQC · pith_short_16: NN2UPGNAQUQCKWFQ · pith_short_8: NN2UPGNA

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/NN2UPGNAQUQCKWFQSWDIKHPDPA \
  | 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: 6b754799a085202558b09586851de37830fa0f5ea5b48e9a06246bededaf710b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b6a720fc14855473bdf3e0774dbde0936c74dae7ea7a226d1f12d1347ab47348",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2019-02-20T16:47:42Z",
    "title_canon_sha256": "eb575b486cc9fcf282b6e79127f65e7373e55200e5906d6de5c1b955a083d4ae"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.07637",
    "kind": "arxiv",
    "version": 2
  }
}