Pith Number

pith:TOB7IBNU

pith:2013:TOB7IBNURKQ6DRPFQVV7PYWFDW

not attested not anchored not stored refs pending

On the Gel'fand-Calder\'on inverse problem in two dimensions

Eemeli Bl{\aa}sten

arxiv:1307.4870 v1 · 2013-07-18 · 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{TOB7IBNURKQ6DRPFQVV7PYWFDW}

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	2026-05-18T00:33:53.605854Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9b83f405b48aa1e1c5e5856bf7e2c51da1c5bda4979e283eb6a616708c056b08

Aliases

arxiv: 1307.4870 · arxiv_version: 1307.4870v1 · doi: 10.48550/arxiv.1307.4870 · pith_short_12: TOB7IBNURKQ6 · pith_short_16: TOB7IBNURKQ6DRPF · pith_short_8: TOB7IBNU

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/TOB7IBNURKQ6DRPFQVV7PYWFDW \
  | 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: 9b83f405b48aa1e1c5e5856bf7e2c51da1c5bda4979e283eb6a616708c056b08

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "35f01edde0b819f6cb6836999e7dc514e92d99db19dde5cffb5e3e54bc3adc3d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2013-07-18T09:06:43Z",
    "title_canon_sha256": "d8dc7763f5a4ae81d38be7a1aa8ff6fe7685fbfb8fc7ef202fd407f25a005959"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1307.4870",
    "kind": "arxiv",
    "version": 1
  }
}