@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00979267v1> a dcat:Dataset ;
    dct:description """
              We study the circulant complex Hadamard matrices of order $n$ whose entries are $l$-th roots of unity. For $n=l$ prime we prove that the only such matrix, up to equivalence, is the Fourier matrix, while for $n=p+q,l=pq$ with $p,q$ distinct primes there is no such matrix. We then provide a list of equivalence classes of such matrices, for small values of $n,l$.
            """ ;
    dct:identifier "hal-00979267" ;
    dct:issued "2026-05-05T14:35:48.720783"^^xsd:dateTime ;
    dct:language "en" ;
    dct:modified "2026-05-05T14:35:48.720788"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Small circulant complex Hadamard matrices of Butson type" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
    dcat:distribution <https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00979267v1/resource/63d216dc-25be-4888-b2f4-5f345f782b55> ;
    dcat:keyword "infoeu-reposemanticspreprint",
        "mathmath-comathematics-mathcombinatorics-mathco",
        "mathmath-famathematics-mathfunctional-analysis-mathfa",
        "preprints-working-papers-" ;
    dcat:landingPage <https://hal.science/hal-00979267> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00979267v1/resource/63d216dc-25be-4888-b2f4-5f345f782b55> a dcat:Distribution ;
    dct:format "HTML" ;
    dct:issued "2026-05-05T14:35:48.722164"^^xsd:dateTime ;
    dct:modified "2026-05-05T14:35:48.715152"^^xsd:dateTime ;
    dct:title "Small circulant complex Hadamard matrices of Butson type" ;
    dcat:accessURL <https://hal.science/hal-00979267> .

<https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> a foaf:Agent ;
    foaf:name "test_moissonnage_selune" .

<https://hal.science/hal-00979267> a foaf:Document .