Pith Number

pith:WI5N7FNT

pith:2009:WI5N7FNTMPHLUEWQU4RD3V374X

not attested not anchored not stored refs pending

Interference channel capacity region for randomized fixed-composition codes

Cheng Chang

arxiv:0901.3809 v1 · 2009-01-24 · cs.IT · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WI5N7FNTMPHLUEWQU4RD3V374X}

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	2026-05-18T00:59:11.490760Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b23adf95b363ceba12d0a7223dd77fe5ea0fbfaabc18b3bbfe850b14eb247c6d

Aliases

arxiv: 0901.3809 · arxiv_version: 0901.3809v1 · doi: 10.48550/arxiv.0901.3809 · pith_short_12: WI5N7FNTMPHL · pith_short_16: WI5N7FNTMPHLUEWQ · pith_short_8: WI5N7FNT

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/WI5N7FNTMPHLUEWQU4RD3V374X \
  | 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: b23adf95b363ceba12d0a7223dd77fe5ea0fbfaabc18b3bbfe850b14eb247c6d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ea9c1e2ae8284aaf842b2c94c0594372e531c519c71a207165b39373ff3859b2",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2009-01-24T01:36:31Z",
    "title_canon_sha256": "358a4c9f0d859bea67fefaf8794cd4d1438ffecbd83f481808295b14d5140ab6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.3809",
    "kind": "arxiv",
    "version": 1
  }
}