Pith Number

pith:TJBUIJQT

pith:2017:TJBUIJQTPY4FCYQOAN5W4PUK3E

not attested not anchored not stored refs pending

A note on alternating projections in Hilbert space

Eva Kopecka, Simeon Reich

arxiv:1702.07239 v1 · 2017-02-23 · math.FA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{TJBUIJQTPY4FCYQOAN5W4PUK3E}

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	2026-05-18T00:50:07.765954Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9a434426137e3851620e037b6e3e8ad92ad599348b024e1a225ecc62929b2003

Aliases

arxiv: 1702.07239 · arxiv_version: 1702.07239v1 · doi: 10.48550/arxiv.1702.07239 · pith_short_12: TJBUIJQTPY4F · pith_short_16: TJBUIJQTPY4FCYQO · pith_short_8: TJBUIJQT

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/TJBUIJQTPY4FCYQOAN5W4PUK3E \
  | 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: 9a434426137e3851620e037b6e3e8ad92ad599348b024e1a225ecc62929b2003

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0a14497522427d26ce393868afb86735266ae67a43e33d2f996af6a3dd0f0e18",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.FA",
    "submitted_at": "2017-02-23T14:49:04Z",
    "title_canon_sha256": "b4181fda3eec51332828491c16fcd68bb9553ca74f29cc0f7ed86fabbbe40b3a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1702.07239",
    "kind": "arxiv",
    "version": 1
  }
}