{"schema_version":"4ort.packet/1","entity":{"entity_id":"wiktor-eckhaus","kg_uuid":"ba5835db-d254-438a-a7f1-016ada2c6531","wikidata_id":"Q15727806","name":"Wiktor Eckhaus","description":"Polish–Dutch mathematician","type":"Person","url":"https://4ort.xyz/entity/wiktor-eckhaus"},"status":"truncated","as_of":{"copy_written_at":"2026-11-01T13:51:52Z","last_source_edit_seen":null,"stale_possible":true,"claims_refreshed_at":null,"source_revision":null},"facts":[{"field":"P31","label":"instance of","value":"human","value_id":"Q5","value_raw":"Q5","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P31","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[]},"trust":{"band":"unscored","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P569","label":"date of birth","value":"1930-06-28","value_id":null,"value_raw":"+1930-06-28T00:00:00Z","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P569","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"KNAW Past Members","stated_in_id":"Q21491701","retrieved":"2017-10-09"},{"imported_from":"German Wikipedia"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P569","label":"date of birth","value":"1929-06-09","value_id":null,"value_raw":"+1929-06-09T00:00:00Z","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P569","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Catalogus Professorum Academiae Rheno-Traiectinae","stated_in_id":"Q23825128","retrieved":"2019-02-05"},{"stated_in":"Biografisch Portaal","stated_in_id":"Q1868372"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P570","label":"date of death","value":"2000-10-01","value_id":null,"value_raw":"+2000-10-01T00:00:00Z","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P570","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"KNAW Past Members","stated_in_id":"Q21491701","retrieved":"2017-10-09"},{"stated_in":"Catalogus Professorum Academiae Rheno-Traiectinae","stated_in_id":"Q23825128","retrieved":"2019-02-05"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P19","label":"place of birth","value":"Skole","value_id":"Q913962","value_raw":"Q913962","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P19","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Catalogus Professorum Academiae Rheno-Traiectinae","stated_in_id":"Q23825128","retrieved":"2019-02-05"},{"retrieved":"2019-09-09"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P19","label":"place of birth","value":"Ivano-Frankivsk","value_id":"Q156726","value_raw":"Q156726","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P19","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Czech National Authority Database","stated_in_id":"Q13550863","retrieved":"2023-01-28"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P20","label":"place of death","value":"Amstelveen","value_id":"Q9898","value_raw":"Q9898","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P20","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"imported_from":"English Wikipedia"}]},"trust":{"band":"medium","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P27","label":"country of citizenship","value":"Kingdom of the Netherlands","value_id":"Q29999","value_raw":"Q29999","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P27","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[]},"trust":{"band":"unscored","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P27","label":"country of citizenship","value":"Poland","value_id":"Q36","value_raw":"Q36","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P27","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"retrieved":"2019-09-09"}]},"trust":{"band":"medium","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P106","label":"occupation","value":"mathematician","value_id":"Q170790","value_raw":"Q170790","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P106","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Czech National Authority Database","stated_in_id":"Q13550863","retrieved":"2023-09-28"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P106","label":"occupation","value":"university teacher","value_id":"Q1622272","value_raw":"Q1622272","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P106","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Catalogus Professorum Academiae Rheno-Traiectinae","stated_in_id":"Q23825128","retrieved":"2019-02-05"},{"stated_in":"dataset Library TU Delft","stated_in_id":"Q65589124","retrieved":"2019-05-20"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P463","label":"member of","value":"Royal Netherlands Academy of Arts and Sciences","value_id":"Q253439","value_raw":"Q253439","rank":"normal","current":true,"qualifiers":[{"field":"P580","label":"start time","value":"1987"}],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P463","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[]},"trust":{"band":"unscored","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P21","label":"sex or gender","value":"male","value_id":"Q6581097","value_raw":"Q6581097","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P21","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Catalogus Professorum Academiae Rheno-Traiectinae","stated_in_id":"Q23825128","retrieved":"2019-02-05"},{"stated_in":"dataset Library TU Delft","stated_in_id":"Q65589124","retrieved":"2019-05-20"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P69","label":"educated at","value":"Delft University of Technology","value_id":"Q752663","value_raw":"Q752663","rank":"normal","current":true,"qualifiers":[{"field":"P580","label":"start time","value":"1948"}],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P69","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[]},"trust":{"band":"unscored","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P69","label":"educated at","value":"Massachusetts Institute of Technology","value_id":"Q49108","value_raw":"Q49108","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P69","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[]},"trust":{"band":"unscored","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P101","label":"field of work","value":"mathematics","value_id":"Q395","value_raw":"Q395","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P101","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Czech National Authority Database","stated_in_id":"Q13550863","retrieved":"2022-11-07"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P101","label":"field of work","value":"theory of differential equations","value_id":"Q28575007","value_raw":"Q28575007","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P101","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Czech National Authority Database","stated_in_id":"Q13550863","retrieved":"2023-01-13"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P103","label":"native language","value":"Polish","value_id":"Q809","value_raw":"Q809","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P103","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[]},"trust":{"band":"unscored","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P108","label":"employer","value":"University of Amsterdam","value_id":"Q214341","value_raw":"Q214341","rank":"normal","current":true,"qualifiers":[{"field":"P580","label":"start time","value":"1964"}],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P108","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[]},"trust":{"band":"unscored","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P108","label":"employer","value":"Centrum Wiskunde & Informatica","value_id":"Q1054410","value_raw":"Q1054410","rank":"normal","current":true,"qualifiers":[{"field":"P580","label":"start time","value":"1964"}],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P108","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[]},"trust":{"band":"unscored","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P108","label":"employer","value":"Utrecht University","value_id":"Q221653","value_raw":"Q221653","rank":"normal","current":false,"qualifiers":[{"field":"P361","label":"part of","value":"Q62416146"},{"field":"P580","label":"start time","value":"1972-02-01"},{"field":"P582","label":"end time","value":"1994-07-01"},{"field":"P1534","label":"end cause","value":"emeritus"}],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P108","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Catalogus Professorum Academiae Rheno-Traiectinae","stated_in_id":"Q23825128","retrieved":"2019-02-05"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P108","label":"employer","value":"Delft University of Technology","value_id":"Q752663","value_raw":"Q752663","rank":"normal","current":false,"qualifiers":[{"field":"P39","label":"position held","value":"Dutch ordinary professor"},{"field":"P580","label":"start time","value":"1965"},{"field":"P582","label":"end time","value":"1972"}],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P108","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"dataset Library TU Delft","stated_in_id":"Q65589124","retrieved":"2019-05-20"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P108","label":"employer","value":"University of Amsterdam","value_id":"Q214341","value_raw":"Q214341","rank":"normal","current":false,"qualifiers":[{"field":"P39","label":"position held","value":"visiting professor"},{"field":"P361","label":"part of","value":"Q62512477"},{"field":"P580","label":"start time","value":"1964"},{"field":"P582","label":"end time","value":"1965"}],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P108","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Album Academicum","stated_in_id":"Q63962284","retrieved":"2019-09-15"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P184","label":"doctoral advisor","value":"Leon Trilling","value_id":"Q102077735","value_raw":"Q102077735","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P184","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Mathematics Genealogy Project","stated_in_id":"Q829984"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P185","label":"doctoral student","value":"W.P.M. de Ruijter","value_id":"Q80761328","value_raw":"Q80761328","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P185","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Mathematics Genealogy Project","stated_in_id":"Q829984"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P185","label":"doctoral student","value":"Jacques Mauss","value_id":"Q102165681","value_raw":"Q102165681","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P185","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Mathematics Genealogy Project","stated_in_id":"Q829984"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P185","label":"doctoral student","value":"Jan Sijbrand","value_id":"Q102165892","value_raw":"Q102165892","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P185","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Mathematics Genealogy Project","stated_in_id":"Q829984"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P185","label":"doctoral student","value":"Jan Geert Besjes","value_id":"Q102166318","value_raw":"Q102166318","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P185","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Mathematics Genealogy Project","stated_in_id":"Q829984"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P185","label":"doctoral student","value":"Gert Rafel","value_id":"Q102183034","value_raw":"Q102183034","rank":"normal","current":null,"qualifiers":[],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P185","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[{"stated_in":"Mathematics Genealogy Project","stated_in_id":"Q829984"}]},"trust":{"band":"high","basis":"wikidata-reference-support/2","calibrated":false}},{"field":"P512","label":"academic degree","value":"Doctor of Science","value_id":"Q2248352","value_raw":"Q2248352","rank":"normal","current":null,"qualifiers":[{"field":"P585","label":"point in time","value":"1959"}],"layer":"source","citation":{"source":"wikidata","source_name":"Wikidata","source_record":"https://www.wikidata.org/wiki/Q15727806#P512","source_edition":null,"edition_basis":"unknown","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"references":[]},"trust":{"band":"unscored","basis":"wikidata-reference-support/2","calibrated":false}}],"unknowns":[],"omitted":{"facts":23,"reason":"max_facts; bare Q-id values without a label are left out"},"licences":[{"source":"wikidata","source_name":"Wikidata","licence":"CC0 1.0 Universal","licence_url":"https://creativecommons.org/publicdomain/zero/1.0/","attribution":null,"fields":["P31","P569","P570","P19","P20","P27","P106","P463","P21","P69","P101","P103","P108","P184","P185","P512"]}],"routes":{"entity_page":"https://4ort.xyz/entity/wiktor-eckhaus","packet_api":"https://4ort.xyz/api/v1/entities/wiktor-eckhaus/packet","facts_jsonld":"https://4ort.xyz/entity/wiktor-eckhaus/facts.json","changes_api":"https://4ort.xyz/api/v1/knowledge/get_entity_changes?entity=wiktor-eckhaus","attention_api":"https://4ort.xyz/api/v1/knowledge/get_attention?entity=wiktor-eckhaus","wikidata":"https://www.wikidata.org/wiki/Q15727806","official_website":null},"trust_rules":{"wikidata-reference-support/2":"From the references in our copy of the statement: high = it cites a source (stated in P248, or a reference URL that is not Wikipedia); medium = only 'imported from Wikimedia project' or a Wikipedia URL; unscored = our copy holds no reference (older copies dropped references, so this is not evidence that Wikidata has none). Wikidata may hold more references than our copy shows. Reference support, not a probability."},"notes":["Our copy of this item's statements has not been checked against Wikidata since tracking began (2026-10-25); a newer value may exist."]}