Pith Number

pith:TF4TI5X6

pith:2018:TF4TI5X6PI6AMQMVADDYDU7NWR

not attested not anchored not stored refs pending

On the spherical quasi-convexity of quadratic functions

L. Xiao, O. P. Ferreira, S. Z. N\'emeth

arxiv:1804.02907 v1 · 2018-04-09 · 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{TF4TI5X6PI6AMQMVADDYDU7NWR}

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	2026-05-18T00:18:57.972252Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

99793476fe7a3c06419500c781d3edb45b98513751acc3bed90673c16be2ca19

Aliases

arxiv: 1804.02907 · arxiv_version: 1804.02907v1 · doi: 10.48550/arxiv.1804.02907 · pith_short_12: TF4TI5X6PI6A · pith_short_16: TF4TI5X6PI6AMQMV · pith_short_8: TF4TI5X6

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/TF4TI5X6PI6AMQMVADDYDU7NWR \
  | 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: 99793476fe7a3c06419500c781d3edb45b98513751acc3bed90673c16be2ca19

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9c650399b2ae92afe072a95f879e447714b11dfbd9118359927ce3dc3e5e8dee",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2018-04-09T10:47:53Z",
    "title_canon_sha256": "cf379c915dbb048c9d4e17e8000838a16847bbef91224600d7af6ec585314868"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.02907",
    "kind": "arxiv",
    "version": 1
  }
}