@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:-VHDD6KJX-8
  skos:prefLabel "analytic number theory"@en, "théorie analytique des nombres"@fr ;
  a skos:Concept ;
  skos:narrower psr:-HHBS82VH-H .

psr: a skos:ConceptScheme .
psr:-HHBS82VH-H
  skos:definition """En mathématiques, le <b>théorème de Brauer-Siegel</b>, du nom de Richard Brauer et Carl Ludwig Siegel, est un résultat asymptotique sur le comportement des corps de nombres, obtenu par Richard Brauer et Carl Ludwig Siegel. Il tente de généraliser les résultats connus sur les nombres de classes des corps quadratiques imaginaires, à une suite plus générale de corps de nombres  <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 K_{1},K_{2},\\\\ldots .}">   <semantics>     <mrow class="MJX-TeXAtom-ORD">       <mstyle displaystyle="true" scriptlevel="0">         <msub>           <mi>K</mi>           <mrow class="MJX-TeXAtom-ORD">             <mn>1</mn>           </mrow>         </msub>         <mo>,</mo>         <msub>           <mi>K</mi>           <mrow class="MJX-TeXAtom-ORD">             <mn>2</mn>           </mrow>         </msub>         <mo>,</mo>         <mo>…<!-- … --></mo>         <mo>.</mo>       </mstyle>     </mrow>     <annotation encoding="application/x-tex">{\\\\displaystyle K_{1},K_{2},\\\\ldots .}</annotation>   </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/51402bf2b22bedf0bbb25e557bbbcd7b72121c6c" class="mwe-math-fallback-image-inline mw-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:11.88ex; height:2.509ex;" alt="{\\\\displaystyle K_{1},K_{2},\\\\ldots .}"></span></dd></dl> Dans tous les cas autres que le corps <b>Q</b> des rationnels et les corps quadratiques imaginaires, le régulateur <i>R</i><sub><i>i</i></sub> de <i>K</i><sub><i>i</i></sub> doit être pris en compte, car <i>K<sub>i</sub></i> a alors des unités d'ordre infini par le théorème des unités de Dirichlet. L'hypothèse quantitative du théorème de Brauer-Siegel standard est que si <i>D</i><sub><i>i</i></sub> est le discriminant de <i>K</i><sub><i>i</i></sub>, alors  <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 {\\rac {[K_{i}:\\\\mathbf {Q} ]}{\\\\log |D_{i}|}}\\	o 0{\\	ext{ quand }}i\\	o \\\\infty .}">   <semantics>     <mrow class="MJX-TeXAtom-ORD">       <mstyle displaystyle="true" scriptlevel="0">         <mrow class="MJX-TeXAtom-ORD">           <mfrac>             <mrow>               <mo stretchy="false">[</mo>               <msub>                 <mi>K</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mi>i</mi>                 </mrow>               </msub>               <mo>:</mo>               <mrow class="MJX-TeXAtom-ORD">                 <mi mathvariant="bold">Q</mi>               </mrow>               <mo stretchy="false">]</mo>             </mrow>             <mrow>               <mi>log</mi>               <mo>⁡<!-- ⁡ --></mo>               <mrow class="MJX-TeXAtom-ORD">                 <mo stretchy="false">|</mo>               </mrow>               <msub>                 <mi>D</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mi>i</mi>                 </mrow>               </msub>               <mrow class="MJX-TeXAtom-ORD">                 <mo stretchy="false">|</mo>               </mrow>             </mrow>           </mfrac>         </mrow>         <mo stretchy="false">→<!-- → --></mo>         <mn>0</mn>         <mrow class="MJX-TeXAtom-ORD">           <mtext> quand </mtext>         </mrow>         <mi>i</mi>         <mo stretchy="false">→<!-- → --></mo>         <mi mathvariant="normal">∞<!-- ∞ --></mi>         <mo>.</mo>       </mstyle>     </mrow>     <annotation encoding="application/x-tex">{\\\\displaystyle {\\rac {[K_{i}:\\\\mathbf {Q} ]}{\\\\log |D_{i}|}}\\	o 0{\\	ext{ quand }}i\\	o \\\\infty .}</annotation>   </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/58b7671048bbb1c569a54d4b90233abdcad5f86b" class="mwe-math-fallback-image-inline mw-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:28.44ex; height:6.509ex;" alt="{\\\\displaystyle {\\rac {[K_{i}:\\\\mathbf {Q} ]}{\\\\log |D_{i}|}}\\	o 0{\\	ext{ quand }}i\\	o \\\\infty .}"></span></dd></dl> En supposant de plus que <i>K</i><sub><i>i</i></sub> est une extension galoisienne de <b>Q</b>, la conclusion est que  <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 {\\rac {\\\\log(h_{i}R_{i})}{\\\\log {\\\\sqrt {|D_{i}|}}}}\\	o 1{\\	ext{ quand }}i\\	o \\\\infty }">   <semantics>     <mrow class="MJX-TeXAtom-ORD">       <mstyle displaystyle="true" scriptlevel="0">         <mrow class="MJX-TeXAtom-ORD">           <mfrac>             <mrow>               <mi>log</mi>               <mo>⁡<!-- ⁡ --></mo>               <mo stretchy="false">(</mo>               <msub>                 <mi>h</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mi>i</mi>                 </mrow>               </msub>               <msub>                 <mi>R</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mi>i</mi>                 </mrow>               </msub>               <mo stretchy="false">)</mo>             </mrow>             <mrow>               <mi>log</mi>               <mo>⁡<!-- ⁡ --></mo>               <mrow class="MJX-TeXAtom-ORD">                 <msqrt>                   <mrow class="MJX-TeXAtom-ORD">                     <mo stretchy="false">|</mo>                   </mrow>                   <msub>                     <mi>D</mi>                     <mrow class="MJX-TeXAtom-ORD">                       <mi>i</mi>                     </mrow>                   </msub>                   <mrow class="MJX-TeXAtom-ORD">                     <mo stretchy="false">|</mo>                   </mrow>                 </msqrt>               </mrow>             </mrow>           </mfrac>         </mrow>         <mo stretchy="false">→<!-- → --></mo>         <mn>1</mn>         <mrow class="MJX-TeXAtom-ORD">           <mtext> quand </mtext>         </mrow>         <mi>i</mi>         <mo stretchy="false">→<!-- → --></mo>         <mi mathvariant="normal">∞<!-- ∞ --></mi>       </mstyle>     </mrow>     <annotation encoding="application/x-tex">{\\\\displaystyle {\\rac {\\\\log(h_{i}R_{i})}{\\\\log {\\\\sqrt {|D_{i}|}}}}\\	o 1{\\	ext{ quand }}i\\	o \\\\infty }</annotation>   </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/22169c8951d828993fbc02f57e9575c08b61d7ed" class="mwe-math-fallback-image-inline mw-invert" aria-hidden="true" style="vertical-align: -3.171ex; width:29.482ex; height:7.009ex;" alt="{\\\\displaystyle {\\rac {\\\\log(h_{i}R_{i})}{\\\\log {\\\\sqrt {|D_{i}|}}}}\\	o 1{\\	ext{ quand }}i\\	o \\\\infty }"></span></dd></dl> où <i>h</i><sub><i>i</i></sub> est le nombre de classes de <i>K</i><sub><i>i</i></sub>. Si l'on suppose que tous les degrés <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 [K_{i}:\\\\mathbf {Q} ]}">   <semantics>     <mrow class="MJX-TeXAtom-ORD">       <mstyle displaystyle="true" scriptlevel="0">         <mo stretchy="false">[</mo>         <msub>           <mi>K</mi>           <mrow class="MJX-TeXAtom-ORD">             <mi>i</mi>           </mrow>         </msub>         <mo>:</mo>         <mrow class="MJX-TeXAtom-ORD">           <mi mathvariant="bold">Q</mi>         </mrow>         <mo stretchy="false">]</mo>       </mstyle>     </mrow>     <annotation encoding="application/x-tex">{\\\\displaystyle [K_{i}:\\\\mathbf {Q} ]}</annotation>   </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/83bad5ddcb70c1d2c4a5a53ca005402a83c70d5c" class="mwe-math-fallback-image-inline mw-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:8.011ex; height:2.843ex;" alt="{\\\\displaystyle [K_{i}:\\\\mathbf {Q} ]}"></span> sont majorés par une même constante <i>N</i>, alors on peut se passer de l'hypothèse de normalité — c'est ce qui est en fait prouvé dans l'article de Brauer. 
<br/>(Wikipedia, L'Encylopédie Libre, <a href="https://fr.wikipedia.org/wiki/Th%C3%A9or%C3%A8me_de_Brauer-Siegel">https://fr.wikipedia.org/wiki/Th%C3%A9or%C3%A8me_de_Brauer-Siegel</a>)"""@fr, """In mathematics, the <b>Brauer–Siegel theorem</b>, named after Richard Brauer and Carl Ludwig Siegel, is an asymptotic result on the behaviour of algebraic number fields, obtained by Richard Brauer and Carl Ludwig Siegel. It attempts to generalise the results known on the class numbers of imaginary quadratic fields, to a more general sequence of number fields  <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 K_{1},K_{2},\\\\ldots .\\\\ }">   <semantics>     <mrow class="MJX-TeXAtom-ORD">       <mstyle displaystyle="true" scriptlevel="0">         <msub>           <mi>K</mi>           <mrow class="MJX-TeXAtom-ORD">             <mn>1</mn>           </mrow>         </msub>         <mo>,</mo>         <msub>           <mi>K</mi>           <mrow class="MJX-TeXAtom-ORD">             <mn>2</mn>           </mrow>         </msub>         <mo>,</mo>         <mo>…<!-- … --></mo>         <mo>.</mo>         <mtext> </mtext>       </mstyle>     </mrow>     <annotation encoding="application/x-tex">{\\\\displaystyle K_{1},K_{2},\\\\ldots .\\\\ }</annotation>   </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/2f43a1253fe29d5bfeb33f72a4a27a1ab9ad456e" class="mwe-math-fallback-image-inline mw-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:12.847ex; height:2.509ex;" alt="K_{1},K_{2},\\\\ldots .\\\\ "></span></dd></dl> In all cases other than the rational field <b>Q</b> and imaginary quadratic fields, the regulator <i>R</i><sub><i>i</i></sub> of <i>K</i><sub><i>i</i></sub> must be taken into account, because <i>K</i><sub>i</sub> then has units of infinite order by Dirichlet's unit theorem. The quantitative hypothesis of the standard Brauer–Siegel theorem is that if <i>D</i><sub><i>i</i></sub> is the discriminant of <i>K</i><sub><i>i</i></sub>, then  <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 {\\rac {[K_{i}:\\\\mathbf {Q} ]}{\\\\log |D_{i}|}}\\	o 0{\\	ext{ as }}i\\	o \\\\infty .}">   <semantics>     <mrow class="MJX-TeXAtom-ORD">       <mstyle displaystyle="true" scriptlevel="0">         <mrow class="MJX-TeXAtom-ORD">           <mfrac>             <mrow>               <mo stretchy="false">[</mo>               <msub>                 <mi>K</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mi>i</mi>                 </mrow>               </msub>               <mo>:</mo>               <mrow class="MJX-TeXAtom-ORD">                 <mi mathvariant="bold">Q</mi>               </mrow>               <mo stretchy="false">]</mo>             </mrow>             <mrow>               <mi>log</mi>               <mo>⁡<!-- ⁡ --></mo>               <mrow class="MJX-TeXAtom-ORD">                 <mo stretchy="false">|</mo>               </mrow>               <msub>                 <mi>D</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mi>i</mi>                 </mrow>               </msub>               <mrow class="MJX-TeXAtom-ORD">                 <mo stretchy="false">|</mo>               </mrow>             </mrow>           </mfrac>         </mrow>         <mo stretchy="false">→<!-- → --></mo>         <mn>0</mn>         <mrow class="MJX-TeXAtom-ORD">           <mtext> as </mtext>         </mrow>         <mi>i</mi>         <mo stretchy="false">→<!-- → --></mo>         <mi mathvariant="normal">∞<!-- ∞ --></mi>         <mo>.</mo>       </mstyle>     </mrow>     <annotation encoding="application/x-tex">{\\\\displaystyle {\\rac {[K_{i}:\\\\mathbf {Q} ]}{\\\\log |D_{i}|}}\\	o 0{\\	ext{ as }}i\\	o \\\\infty .}</annotation>   </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c639b8f9d1605076cb35f9453230453763c971d3" class="mwe-math-fallback-image-inline mw-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:24.251ex; height:6.509ex;" alt="{\\\\displaystyle {\\rac {[K_{i}:\\\\mathbf {Q} ]}{\\\\log |D_{i}|}}\\	o 0{\\	ext{ as }}i\\	o \\\\infty .}"></span></dd></dl> Assuming that, and the algebraic hypothesis that <i>K</i><sub><i>i</i></sub> is a Galois extension of <b>Q</b>, the conclusion is that  <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 {\\rac {\\\\log(h_{i}R_{i})}{\\\\log {\\\\sqrt {|D_{i}|}}}}\\	o 1{\\	ext{ as }}i\\	o \\\\infty }">   <semantics>     <mrow class="MJX-TeXAtom-ORD">       <mstyle displaystyle="true" scriptlevel="0">         <mrow class="MJX-TeXAtom-ORD">           <mfrac>             <mrow>               <mi>log</mi>               <mo>⁡<!-- ⁡ --></mo>               <mo stretchy="false">(</mo>               <msub>                 <mi>h</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mi>i</mi>                 </mrow>               </msub>               <msub>                 <mi>R</mi>                 <mrow class="MJX-TeXAtom-ORD">                   <mi>i</mi>                 </mrow>               </msub>               <mo stretchy="false">)</mo>             </mrow>             <mrow>               <mi>log</mi>               <mo>⁡<!-- ⁡ --></mo>               <mrow class="MJX-TeXAtom-ORD">                 <msqrt>                   <mrow class="MJX-TeXAtom-ORD">                     <mo stretchy="false">|</mo>                   </mrow>                   <msub>                     <mi>D</mi>                     <mrow class="MJX-TeXAtom-ORD">                       <mi>i</mi>                     </mrow>                   </msub>                   <mrow class="MJX-TeXAtom-ORD">                     <mo stretchy="false">|</mo>                   </mrow>                 </msqrt>               </mrow>             </mrow>           </mfrac>         </mrow>         <mo stretchy="false">→<!-- → --></mo>         <mn>1</mn>         <mrow class="MJX-TeXAtom-ORD">           <mtext> as </mtext>         </mrow>         <mi>i</mi>         <mo stretchy="false">→<!-- → --></mo>         <mi mathvariant="normal">∞<!-- ∞ --></mi>       </mstyle>     </mrow>     <annotation encoding="application/x-tex">{\\\\displaystyle {\\rac {\\\\log(h_{i}R_{i})}{\\\\log {\\\\sqrt {|D_{i}|}}}}\\	o 1{\\	ext{ as }}i\\	o \\\\infty }</annotation>   </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ac132a9af54130c63b215c9ff06023689c939630" class="mwe-math-fallback-image-inline mw-invert" aria-hidden="true" style="vertical-align: -3.171ex; width:25.293ex; height:7.009ex;" alt="{\\rac  {\\\\log(h_{i}R_{i})}{\\\\log {\\\\sqrt  {|D_{i}|}}}}\\	o 1{\\	ext{ as }}i\\	o \\\\infty "></span></dd></dl> where <i>h</i><sub><i>i</i></sub> is the class number of <i>K</i><sub><i>i</i></sub>. If one assumes that all the degrees <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 [K_{i}:\\\\mathbf {Q} ]}">   <semantics>     <mrow class="MJX-TeXAtom-ORD">       <mstyle displaystyle="true" scriptlevel="0">         <mo stretchy="false">[</mo>         <msub>           <mi>K</mi>           <mrow class="MJX-TeXAtom-ORD">             <mi>i</mi>           </mrow>         </msub>         <mo>:</mo>         <mrow class="MJX-TeXAtom-ORD">           <mi mathvariant="bold">Q</mi>         </mrow>         <mo stretchy="false">]</mo>       </mstyle>     </mrow>     <annotation encoding="application/x-tex">{\\\\displaystyle [K_{i}:\\\\mathbf {Q} ]}</annotation>   </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/83bad5ddcb70c1d2c4a5a53ca005402a83c70d5c" class="mwe-math-fallback-image-inline mw-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:8.011ex; height:2.843ex;" alt="{\\\\displaystyle [K_{i}:\\\\mathbf {Q} ]}"></span> are bounded above by a uniform constant <i>N</i>, then one may drop the assumption of normality - this is what is actually proved in Brauer's paper.   
<br/>(Wikipedia, The Free Encyclopedia, <a href="https://en.wikipedia.org/wiki/Brauer%E2%80%93Siegel_theorem">https://en.wikipedia.org/wiki/Brauer%E2%80%93Siegel_theorem</a>)"""@en ;
  skos:prefLabel "Brauer-Siegel theorem"@en, "théorème de Brauer-Siegel"@fr ;
  skos:inScheme psr: ;
  skos:broader psr:-VHDD6KJX-8 ;
  skos:exactMatch <https://en.wikipedia.org/wiki/Brauer%E2%80%93Siegel_theorem>, <https://fr.wikipedia.org/wiki/Th%C3%A9or%C3%A8me_de_Brauer-Siegel> ;
  dc:created "2023-08-17"^^xsd:date ;
  dc:modified "2024-10-18"^^xsd:date ;
  a skos:Concept .

