https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/Head
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://www.nanopub.org/nschema#hasAssertion
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/assertion
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://www.nanopub.org/nschema#hasProvenance
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/provenance
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://www.nanopub.org/nschema#hasPublicationInfo
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/pubinfo
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.nanopub.org/nschema#Nanopublication
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/assertion
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/geolean-citation
http://purl.org/dc/terms/description
This statement was verified by Myles Axton (orcid:0000-0002-8042-4131) on 2026-07-18T15:17:00Z (16:17 UTC+1).
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/geolean-citation
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
https://schema.org/Comment
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/geolean-citation
http://www.w3.org/ns/prov#wasAttributedTo
https://orcid.org/0000-0002-8042-4131
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/geolean-citation
https://schema.org/citation
Bhavik Mehta, Zulip (leanprover-community.github.io archive), "tarski axiom geometry" topic, Oct 20 2021 at 12:39: "In the GeoLean branch of mathlib I also did a development of Tarskis axioms, covering about 70% of the Tarski work in the GeoCoq project."
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/geolean-citation
https://schema.org/name
GeoLean citation and human verification
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/geolean-citation
https://schema.org/url
https://leanprover-community.github.io/archive/stream/116395-maths/topic/tarski.20axiom.20geometry.html
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/motivation
http://purl.org/dc/terms/description
The motivation of this nanopublication is to advance the use of FAIA and ISCC to add provenance and human/agent-role attribution to the formalization of our shared mathematical culture. In particular, this nanopublication explores the negative space of what was not done. Many people over roughly 2500 years of mathematics deserve credit for the development of formal mathematical axioms and theorems. By formalizing part of this historical trajectory, this artifact is offered as a substrate for nanopublications that restore context and provenance to results typically stripped down to their elegant statement and proof — to the lamentation of teachers, students, engineers, statisticians, and curious readers.
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/motivation
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
urn:sandbox:tarski-lean4-negative-space:vocab#Motivation
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/motivation
https://schema.org/name
Why this negative-space companion exists
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
http://purl.org/dc/terms/description
Every axiom and every theorem in the bound artifact is prior art. The AI's contribution is confined to Lean 4 engineering and exposition; where proof details were re-derived in-session rather than recalled, what was re-derived is known mathematics. The complete inventory:
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
urn:sandbox:tarski-lean4-negative-space:vocab#NonOrigination
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
https://schema.org/name
What the AI did not originate: the mathematics — all of it
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#concerns
https://w3id.org/np/RAXut_tYBIBaf53frjHN9ttCnUj4zq8JhXllSz7MyKpME/artifact
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
Axioms A1–A8 (cong_pseudo_refl, cong_inner_trans, cong_identity, segment_construction, five_segment, betw_identity, inner_pasch, lower_dim) — Tarski, 1926–27; A7 after Pasch, 1882
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
Col, Out, SegLe and their permutation/trivia lemmas — SST ch. 4–6 vocabulary
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
Cong3 — SST Def. 4.1 (GeoCoq Cong_3)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
Midpoint, midpoint_refl, midpoint_symm — SST ch. 7 vocabulary
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
betw_exchange2 — SST 3.6(2) (GeoCoq between_exchange2)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
betw_exchange_left — SST 3.6(1)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
betw_inner_trans — SST 3.5
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
betw_left_trivial — SST 3.3
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
betw_outer_trans — SST 3.7(1)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
betw_outer_trans' — SST 3.7(2)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
betw_symm — SST 3.2
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
betw_transfer — SST 4.6 (GeoCoq l4_6)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
betw_trivial — SST 3.1
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong3_construction — SST 4.5 (GeoCoq l4_5)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong_add — SST 2.11 (GeoCoq l2_11)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong_comm — corollary of SST 2.4 + 2.5
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong_left_comm — SST 2.4
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong_refl — SST 2.1
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong_reverse_identity — corollary of axiom A3
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong_right_comm — SST 2.5
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong_sub — SST 4.3 (GeoCoq l4_3)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong_symm — SST 2.2
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong_trans — SST 2.3
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
cong_trivial — SST 2.8
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
construction_uniqueness — SST 2.12
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
inner_five_segment — SST 4.2 (GeoCoq l4_2)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
reflect_betw — SST 7.15 (GeoCoq l7_15)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
reflect_cong — SST 7.13 (GeoCoq l7_13)
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
symmetric_point_exists — SST 7.4
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/non-origination
urn:sandbox:tarski-lean4-negative-space:vocab#items
symmetric_point_uniqueness — SST 7.5
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/prior-art-geolean
http://purl.org/dc/terms/description
To the drafting AI's knowledge, Claude did not consult or port GeoLean in producing Tarski.lean. But GeoLean — Joseph Myers's Lean formalization of a large portion of GeoCoq's Tarski development, on a mathlib3 branch — predates this artifact and must be cited as a sibling ancestor alongside GeoCoq. The community view at the time (see sub:geolean-citation) was that axiomatic geometry belongs in standalone projects rather than in Mathlib itself. Tarski.lean is therefore not the first formalization of Tarski's axioms in Lean, but is, to the same knowledge, the first done as a self-contained, native-style Lean 4 development (GeoLean is Lean 3, Coq-styled).
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/prior-art-geolean
http://purl.org/dc/terms/source
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/geolean-citation
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/prior-art-geolean
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
urn:sandbox:tarski-lean4-negative-space:vocab#PriorArtDisclosure
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/prior-art-geolean
https://schema.org/name
Prior art the artifact does not originate: GeoLean
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/prior-art-geolean
urn:sandbox:tarski-lean4-negative-space:vocab#concerns
https://w3id.org/np/RAXut_tYBIBaf53frjHN9ttCnUj4zq8JhXllSz7MyKpME/artifact
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/unclaimed-credit
http://purl.org/dc/terms/description
As of this nanopublication's original drafting (2026-07-18T11:11:40Z), credit:validation — verification by compilation (`lean Tarski.lean`) — was claimed by no party: the artifact had never been compiled, and every correctness claim was a hand-verification claim. That gap has since closed. A follow-up session compiled the artifact successfully under two independent Lean 4 toolchains (leanprover/lean4-nightly:nightly-2023-05-16 and leanprover/lean4:v4.32.0), after finding and fixing the one error present (a use of Mathlib's `∃!` notation, unavailable in core Lean 4). credit:validation is now jointly claimed by Claude and Myles Axton, as recorded in the companion positive-space nanopublication (see sub:pubinfo dct:references).
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/unclaimed-credit
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
urn:sandbox:tarski-lean4-negative-space:vocab#UnclaimedCredit
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/unclaimed-credit
http://www.w3.org/ns/prov#hadRole
https://credit.niso.org/contributor-roles/validation
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/unclaimed-credit
https://schema.org/name
Credit that was unclaimed when this inventory was first drafted — since resolved
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/provenance
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/activity
http://purl.org/dc/terms/description
Drafted in the same sandboxed session as the artifact it concerns, as a companion to the positive declaration, subsequently compiled, signed, and published as https://w3id.org/np/RAXut_tYBIBaf53frjHN9ttCnUj4zq8JhXllSz7MyKpME. The inventory was compiled by reading the artifact's theorem list against the SST concordance recorded there. Revised in a follow-up session to update the stale compilation-status claim, and to incorporate two further disclosures supplied by the human party: the motivation for this negative-space companion, and the GeoLean prior-art citation (with its Zulip source and human verification).
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/activity
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#Activity
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/activity
http://www.w3.org/ns/prov#startedAtTime
2026-07-18T11:11:40Z
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/activity
http://www.w3.org/ns/prov#wasAssociatedWith
https://w3id.org/np/RAXut_tYBIBaf53frjHN9ttCnUj4zq8JhXllSz7MyKpME/agent-claude
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/activity
http://www.w3.org/ns/prov#wasAssociatedWith
https://w3id.org/np/RAXut_tYBIBaf53frjHN9ttCnUj4zq8JhXllSz7MyKpME/agent-user
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/activity
https://schema.org/name
Negative-space inventory
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/assertion
http://www.w3.org/ns/prov#wasGeneratedBy
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/activity
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/pubinfo
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://purl.org/dc/terms/created
2026-07-18T15:28:18Z
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://purl.org/dc/terms/creator
https://orcid.org/0000-0002-8042-4131
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://purl.org/dc/terms/creator
https://w3id.org/np/RAXut_tYBIBaf53frjHN9ttCnUj4zq8JhXllSz7MyKpME/agent-claude
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://purl.org/dc/terms/creator
https://w3id.org/np/RAXut_tYBIBaf53frjHN9ttCnUj4zq8JhXllSz7MyKpME/agent-user
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://purl.org/dc/terms/description
Negative-space companion to the Tarski.lean provenance declaration: what the artifact does not originate (the mathematics, all of it, and GeoLean as uncredited-until-now sibling prior art), and credit that was unclaimed as of first drafting. The neg: vocabulary used here is proposed and local to this declaration, not an established standard.
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://purl.org/dc/terms/license
https://creativecommons.org/licenses/by/4.0/
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://purl.org/dc/terms/references
https://w3id.org/np/RAXut_tYBIBaf53frjHN9ttCnUj4zq8JhXllSz7MyKpME
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://www.w3.org/2000/01/rdf-schema#label
Tarski.lean negative-space declaration
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
http://www.w3.org/ns/prov#generatedAtTime
2026-07-18T15:28:18Z
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
https://w3id.org/np/o/ntemplate/wasCreatedFromProvenanceTemplate
http://purl.org/np/RANwQa4ICWS5SOjw7gp99nBpXBasapwtZF1fIM3H2gYTM
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
https://w3id.org/np/o/ntemplate/wasCreatedFromPubinfoTemplate
http://purl.org/np/RAA2MfqdBCzmz9yVWjKLXNbyfBNcwsMmOqcNUxkk1maIM
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
https://w3id.org/np/o/ntemplate/wasCreatedFromPubinfoTemplate
http://purl.org/np/RAjpBMlw3owYhJUBo3DtsuDlXsNAJ8cnGeWAutDVjuAuI
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
https://w3id.org/np/o/ntemplate/wasCreatedFromTemplate
http://purl.org/np/RAFu2BNmgHrjOTJ8SKRnKaRp-VP8AOOb7xX88ob0DZRsU
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/sig
http://purl.org/nanopub/x/hasAlgorithm
RSA
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/sig
http://purl.org/nanopub/x/hasPublicKey
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https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/sig
http://purl.org/nanopub/x/hasSignature
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https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/sig
http://purl.org/nanopub/x/hasSignatureTarget
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg
https://w3id.org/np/RAbyUSg8hPy5xsGsGyFVyIoSk3XkETkUo3mg0aMxepyPg/sig
http://purl.org/nanopub/x/signedBy
https://orcid.org/0000-0002-8042-4131