Pith Number

pith:SDSPZKZM

pith:2016:SDSPZKZM2YMGV3DSRABRWN3Z2N

not attested not anchored not stored refs pending

Symmetric orthogonality and non-expansive projections in metric spaces

Martin Kell

arxiv:1604.01993 v2 · 2016-04-07 · math.MG · math.DG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SDSPZKZM2YMGV3DSRABRWN3Z2N}

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	2026-05-18T00:30:09.286255Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

90e4fcab2cd6186aec7288031b3779d358130af0fb76583b9747a52fddbe93ca

Aliases

arxiv: 1604.01993 · arxiv_version: 1604.01993v2 · doi: 10.48550/arxiv.1604.01993 · pith_short_12: SDSPZKZM2YMG · pith_short_16: SDSPZKZM2YMGV3DS · pith_short_8: SDSPZKZM

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/SDSPZKZM2YMGV3DSRABRWN3Z2N \
  | 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: 90e4fcab2cd6186aec7288031b3779d358130af0fb76583b9747a52fddbe93ca

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7ec6d59111cd0314dd196a50fc12c537143f527f63406334494c91475469b065",
    "cross_cats_sorted": [
      "math.DG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.MG",
    "submitted_at": "2016-04-07T13:35:01Z",
    "title_canon_sha256": "cd877f261771376553a3b320a6dc26039c33c8278f30493c008e270c045117ca"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1604.01993",
    "kind": "arxiv",
    "version": 2
  }
}