Pith Number

pith:FDPJX6ZO

pith:2015:FDPJX6ZO6POWK4BQTTESMRKP4A

not attested not anchored not stored refs pending

On the topology of some quasi-projective surfaces

Alexandru Dimca

arxiv:1504.07125 v2 · 2015-04-27 · math.AG · math.AT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FDPJX6ZO6POWK4BQTTESMRKP4A}

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	2026-05-18T00:36:33.636565Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

28de9bfb2ef3dd6570309cc926454fe01617340c8dbaa74aeb79728cd357836e

Aliases

arxiv: 1504.07125 · arxiv_version: 1504.07125v2 · doi: 10.48550/arxiv.1504.07125 · pith_short_12: FDPJX6ZO6POW · pith_short_16: FDPJX6ZO6POWK4BQ · pith_short_8: FDPJX6ZO

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/FDPJX6ZO6POWK4BQTTESMRKP4A \
  | 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: 28de9bfb2ef3dd6570309cc926454fe01617340c8dbaa74aeb79728cd357836e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "55192a8321c9e2f5541a854704da2734bb32bbcfac07f3b17788fc2dfa3bbb24",
    "cross_cats_sorted": [
      "math.AT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2015-04-27T15:12:03Z",
    "title_canon_sha256": "6ac27b22a8f3bdbd8fce9574fb4ef177f05520ed7d1392c9e7eb1649b3f93d5d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.07125",
    "kind": "arxiv",
    "version": 2
  }
}