Pith Number

pith:7A6SPW2S

pith:2012:7A6SPW2SMR23UZMBWZTQYSVNMP

not attested not anchored not stored refs pending

Gradient-based estimation of Manning's friction coefficient from noisy data

Bangti Jin, Hany Radwan, Matthias Gehre, Nathan Collier, Victor M. Calo

arxiv:1204.1709 v1 · 2012-04-08 · math.NA · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7A6SPW2SMR23UZMBWZTQYSVNMP}

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	2026-05-18T03:58:23.347910Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f83d27db526475ba6581b6670c4aad63f136d44955cb52f27502f0113336e253

Aliases

arxiv: 1204.1709 · arxiv_version: 1204.1709v1 · doi: 10.48550/arxiv.1204.1709 · pith_short_12: 7A6SPW2SMR23 · pith_short_16: 7A6SPW2SMR23UZMB · pith_short_8: 7A6SPW2S

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/7A6SPW2SMR23UZMBWZTQYSVNMP \
  | 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: f83d27db526475ba6581b6670c4aad63f136d44955cb52f27502f0113336e253

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a62afdd9268090ba2cbe8009296b036bb6f7bed340ab5c8aa53b47509b5bc0f5",
    "cross_cats_sorted": [
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2012-04-08T04:44:40Z",
    "title_canon_sha256": "58a067f0c3fba244893abb1a5769df92b078ec42342c9a52dc4fdb25efef7223"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1204.1709",
    "kind": "arxiv",
    "version": 1
  }
}