@prefix psr: <http://data.loterre.fr/ark:/67375/PSR> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

psr: a skos:ConceptScheme .
psr:-NHFK3Q1R-H
  skos:prefLabel "fonction L"@fr, "L-function"@en ;
  a skos:Concept ;
  skos:narrower psr:-S1XSWW2H-7 .

psr:-S1XSWW2H-7
  dc:modified "2024-10-18"^^xsd:date ;
  skos:definition """En mathématiques, les <b>fonctions zêta multiples</b> sont des généralisations de la fonction zêta de Riemann, définie par  <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\\\\displaystyle \\\\zeta (s_{1},\\\\ldots ,s_{k})=\\\\sum _{n_{1}>n_{2}>\\\\cdots >n_{k}>0}\\\\ {\\rac {1}{n_{1}^{s_{1}}\\\\cdots n_{k}^{s_{k}}}}=\\\\sum _{n_{1}>n_{2}>\\\\cdots >n_{k}>0}\\\\ \\\\prod _{i=1}^{k}{\\rac {1}{n_{i}^{s_{i}}}},\\\\!}">   <semantics>     <mrow class="MJX-TeXAtom-ORD">       <mstyle displaystyle="true" scriptlevel="0">         <mi>ζ<!-- ζ --></mi>         <mo stretchy="false">(</mo>         <msub>           <mi>s</mi>           <mrow class="MJX-TeXAtom-ORD">             <mn>1</mn>           </mrow>         </msub>         <mo>,</mo>         <mo>…<!-- … --></mo>         <mo>,</mo>         <msub>           <mi>s</mi>           <mrow class="MJX-TeXAtom-ORD">             <mi>k</mi>           </mrow>         </msub>         <mo stretchy="false">)</mo>         <mo>=</mo>         <munder>           <mo>∑<!-- ∑ --></mo>           <mrow class="MJX-TeXAtom-ORD">             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mn>1</mn>               </mrow>             </msub>             <mo>&gt;</mo>             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mn>2</mn>               </mrow>             </msub>             <mo>&gt;</mo>             <mo>⋯<!-- ⋯ --></mo>             <mo>&gt;</mo>             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mi>k</mi>               </mrow>             </msub>             <mo>&gt;</mo>             <mn>0</mn>           </mrow>         </munder>         <mtext> </mtext>         <mrow class="MJX-TeXAtom-ORD">           <mfrac>             <mn>1</mn>             <mrow>               <msubsup>                 <mi>n</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mn>1</mn>                 </mrow>                 <mrow class="MJX-TeXAtom-ORD">                   <msub>                     <mi>s</mi>                     <mrow class="MJX-TeXAtom-ORD">                       <mn>1</mn>                     </mrow>                   </msub>                 </mrow>               </msubsup>               <mo>⋯<!-- ⋯ --></mo>               <msubsup>                 <mi>n</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mi>k</mi>                 </mrow>                 <mrow class="MJX-TeXAtom-ORD">                   <msub>                     <mi>s</mi>                     <mrow class="MJX-TeXAtom-ORD">                       <mi>k</mi>                     </mrow>                   </msub>                 </mrow>               </msubsup>             </mrow>           </mfrac>         </mrow>         <mo>=</mo>         <munder>           <mo>∑<!-- ∑ --></mo>           <mrow class="MJX-TeXAtom-ORD">             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mn>1</mn>               </mrow>             </msub>             <mo>&gt;</mo>             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mn>2</mn>               </mrow>             </msub>             <mo>&gt;</mo>             <mo>⋯<!-- ⋯ --></mo>             <mo>&gt;</mo>             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mi>k</mi>               </mrow>             </msub>             <mo>&gt;</mo>             <mn>0</mn>           </mrow>         </munder>         <mtext> </mtext>         <munderover>           <mo>∏<!-- ∏ --></mo>           <mrow class="MJX-TeXAtom-ORD">             <mi>i</mi>             <mo>=</mo>             <mn>1</mn>           </mrow>           <mrow class="MJX-TeXAtom-ORD">             <mi>k</mi>           </mrow>         </munderover>         <mrow class="MJX-TeXAtom-ORD">           <mfrac>             <mn>1</mn>             <msubsup>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mi>i</mi>               </mrow>               <mrow class="MJX-TeXAtom-ORD">                 <msub>                   <mi>s</mi>                   <mrow class="MJX-TeXAtom-ORD">                     <mi>i</mi>                   </mrow>                 </msub>               </mrow>             </msubsup>           </mfrac>         </mrow>         <mo>,</mo>         <mspace width="negativethinmathspace"></mspace>       </mstyle>     </mrow>     <annotation encoding="application/x-tex">{\\\\displaystyle \\\\zeta (s_{1},\\\\ldots ,s_{k})=\\\\sum _{n_{1}&gt;n_{2}&gt;\\\\cdots &gt;n_{k}&gt;0}\\\\ {\\rac {1}{n_{1}^{s_{1}}\\\\cdots n_{k}^{s_{k}}}}=\\\\sum _{n_{1}&gt;n_{2}&gt;\\\\cdots &gt;n_{k}&gt;0}\\\\ \\\\prod _{i=1}^{k}{\\rac {1}{n_{i}^{s_{i}}}},\\\\!}</annotation>   </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0d922a307c2a9c686e47cbd203c617729821013c" class="mwe-math-fallback-image-inline mw-invert" aria-hidden="true" style="vertical-align: -3.338ex; margin-right: -0.229ex; width:66.138ex; height:7.676ex;" alt="{\\\\displaystyle \\\\zeta (s_{1},\\\\ldots ,s_{k})=\\\\sum _{n_{1}>n_{2}>\\\\cdots >n_{k}>0}\\\\ {\\rac {1}{n_{1}^{s_{1}}\\\\cdots n_{k}^{s_{k}}}}=\\\\sum _{n_{1}>n_{2}>\\\\cdots >n_{k}>0}\\\\ \\\\prod _{i=1}^{k}{\\rac {1}{n_{i}^{s_{i}}}},\\\\!}"></span></dd></dl> et converge lorsque <span class="texhtml">Re(<i>s</i><sub>1</sub>) + . . . + Re(<i>s<sub>i</sub></i>) &gt; <i>i</i></span> pour tout <span class="texhtml"><i>i</i>–1 &lt; <i>k</i></span>. Comme la fonction zêta de Riemann, les fonctions zêta multiples peuvent être prolongée analytiquement en des fonctions méromorphes (voir, par exemple, Zhao (1999)). Lorsque <i>s</i><sub>1</sub>..., <i>s</i><sub><i>k</i></sub> sont des entiers positifs (avec <i>s</i><sub>1</sub> &gt; 1) ces sommes sont souvent appelées <b>valeurs zêta multiples</b> (VZM) ou <b>sommes d'Euler</b></span>. Dans la définition ci-dessus, <i>k</i> est nommé la « profondeur » d'une VZM, et <i>n</i> = <i>s</i><sub>1</sub> + ... + <i>s</i><sub><i>k</i></sub> est le « poids »</span>.  
<br/>(Wikipedia, L'Encylopédie Libre, <a href="https://fr.wikipedia.org/wiki/Fonction_z%C3%AAta_multiple">https://fr.wikipedia.org/wiki/Fonction_z%C3%AAta_multiple</a>)"""@fr, """In mathematics, the <b>multiple zeta functions</b> are generalizations of the Riemann zeta function, defined by  <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\\\\displaystyle \\\\zeta (s_{1},\\\\ldots ,s_{k})=\\\\sum _{n_{1}>n_{2}>\\\\cdots >n_{k}>0}\\\\ {\\rac {1}{n_{1}^{s_{1}}\\\\cdots n_{k}^{s_{k}}}}=\\\\sum _{n_{1}>n_{2}>\\\\cdots >n_{k}>0}\\\\ \\\\prod _{i=1}^{k}{\\rac {1}{n_{i}^{s_{i}}}},\\\\!}">   <semantics>     <mrow class="MJX-TeXAtom-ORD">       <mstyle displaystyle="true" scriptlevel="0">         <mi>ζ<!-- ζ --></mi>         <mo stretchy="false">(</mo>         <msub>           <mi>s</mi>           <mrow class="MJX-TeXAtom-ORD">             <mn>1</mn>           </mrow>         </msub>         <mo>,</mo>         <mo>…<!-- … --></mo>         <mo>,</mo>         <msub>           <mi>s</mi>           <mrow class="MJX-TeXAtom-ORD">             <mi>k</mi>           </mrow>         </msub>         <mo stretchy="false">)</mo>         <mo>=</mo>         <munder>           <mo>∑<!-- ∑ --></mo>           <mrow class="MJX-TeXAtom-ORD">             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mn>1</mn>               </mrow>             </msub>             <mo>&gt;</mo>             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mn>2</mn>               </mrow>             </msub>             <mo>&gt;</mo>             <mo>⋯<!-- ⋯ --></mo>             <mo>&gt;</mo>             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mi>k</mi>               </mrow>             </msub>             <mo>&gt;</mo>             <mn>0</mn>           </mrow>         </munder>         <mtext> </mtext>         <mrow class="MJX-TeXAtom-ORD">           <mfrac>             <mn>1</mn>             <mrow>               <msubsup>                 <mi>n</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mn>1</mn>                 </mrow>                 <mrow class="MJX-TeXAtom-ORD">                   <msub>                     <mi>s</mi>                     <mrow class="MJX-TeXAtom-ORD">                       <mn>1</mn>                     </mrow>                   </msub>                 </mrow>               </msubsup>               <mo>⋯<!-- ⋯ --></mo>               <msubsup>                 <mi>n</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mi>k</mi>                 </mrow>                 <mrow class="MJX-TeXAtom-ORD">                   <msub>                     <mi>s</mi>                     <mrow class="MJX-TeXAtom-ORD">                       <mi>k</mi>                     </mrow>                   </msub>                 </mrow>               </msubsup>             </mrow>           </mfrac>         </mrow>         <mo>=</mo>         <munder>           <mo>∑<!-- ∑ --></mo>           <mrow class="MJX-TeXAtom-ORD">             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mn>1</mn>               </mrow>             </msub>             <mo>&gt;</mo>             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mn>2</mn>               </mrow>             </msub>             <mo>&gt;</mo>             <mo>⋯<!-- ⋯ --></mo>             <mo>&gt;</mo>             <msub>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mi>k</mi>               </mrow>             </msub>             <mo>&gt;</mo>             <mn>0</mn>           </mrow>         </munder>         <mtext> </mtext>         <munderover>           <mo>∏<!-- ∏ --></mo>           <mrow class="MJX-TeXAtom-ORD">             <mi>i</mi>             <mo>=</mo>             <mn>1</mn>           </mrow>           <mrow class="MJX-TeXAtom-ORD">             <mi>k</mi>           </mrow>         </munderover>         <mrow class="MJX-TeXAtom-ORD">           <mfrac>             <mn>1</mn>             <msubsup>               <mi>n</mi>               <mrow class="MJX-TeXAtom-ORD">                 <mi>i</mi>               </mrow>               <mrow class="MJX-TeXAtom-ORD">                 <msub>                   <mi>s</mi>                   <mrow class="MJX-TeXAtom-ORD">                     <mi>i</mi>                   </mrow>                 </msub>               </mrow>             </msubsup>           </mfrac>         </mrow>         <mo>,</mo>         <mspace width="negativethinmathspace"></mspace>       </mstyle>     </mrow>     <annotation encoding="application/x-tex">{\\\\displaystyle \\\\zeta (s_{1},\\\\ldots ,s_{k})=\\\\sum _{n_{1}&gt;n_{2}&gt;\\\\cdots &gt;n_{k}&gt;0}\\\\ {\\rac {1}{n_{1}^{s_{1}}\\\\cdots n_{k}^{s_{k}}}}=\\\\sum _{n_{1}&gt;n_{2}&gt;\\\\cdots &gt;n_{k}&gt;0}\\\\ \\\\prod _{i=1}^{k}{\\rac {1}{n_{i}^{s_{i}}}},\\\\!}</annotation>   </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0d922a307c2a9c686e47cbd203c617729821013c" class="mwe-math-fallback-image-inline mw-invert" aria-hidden="true" style="vertical-align: -3.338ex; margin-right: -0.229ex; width:66.138ex; height:7.676ex;" alt="{\\\\displaystyle \\\\zeta (s_{1},\\\\ldots ,s_{k})=\\\\sum _{n_{1}>n_{2}>\\\\cdots >n_{k}>0}\\\\ {\\rac {1}{n_{1}^{s_{1}}\\\\cdots n_{k}^{s_{k}}}}=\\\\sum _{n_{1}>n_{2}>\\\\cdots >n_{k}>0}\\\\ \\\\prod _{i=1}^{k}{\\rac {1}{n_{i}^{s_{i}}}},\\\\!}"></span></dd></dl> and converge when Re(<i>s</i><sub>1</sub>) + ... + Re(<i>s</i><sub><i>i</i></sub>) &gt; <i>i</i> for all <i>i</i>. Like the Riemann zeta function, the multiple zeta functions can be analytically continued to be meromorphic functions (see, for example, Zhao  (1999)). When <i>s</i><sub>1</sub>, ..., <i>s</i><sub><i>k</i></sub> are all positive integers (with <i>s</i><sub>1</sub> &gt; 1) these sums are often called <b>multiple zeta values</b> (MZVs) or <b>Euler sums</b>. These values can also be regarded as special values of the multiple polylogarithms. The <i>k</i> in the above definition is named the "depth" of a MZV, and the <i>n</i> = <i>s</i><sub>1</sub> + ... + <i>s</i><sub><i>k</i></sub> is known as the "weight". 
<br/>(Wikipedia, The Free Encyclopedia, <a href="https://en.wikipedia.org/wiki/Multiple_zeta_function">https://en.wikipedia.org/wiki/Multiple_zeta_function</a>)"""@en ;
  skos:inScheme psr: ;
  skos:prefLabel "fonction zêta multiple"@fr, "multiple zeta function"@en ;
  skos:broader psr:-NHFK3Q1R-H ;
  a skos:Concept ;
  dc:created "2023-08-04"^^xsd:date ;
  skos:exactMatch <https://en.wikipedia.org/wiki/Multiple_zeta_function>, <https://fr.wikipedia.org/wiki/Fonction_z%C3%AAta_multiple> .

