<div dir="ltr"><div style="padding:20px 0px 0px;font-size:0.875rem;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif"><table cellpadding="0" style="border-collapse:collapse;margin-top:0px;width:auto;font-size:0.875rem;letter-spacing:0.2px;display:block"><tbody style="display:block"></tbody></table><span style="font-size:0.875rem;color:rgb(0,0,0);font-family:Helvetica">Nell&#39;ambito del progetto</span><span style="font-size:0.875rem;color:rgb(0,0,0);font-family:Helvetica"> </span><i style="font-size:0.875rem;color:rgb(0,0,0);font-family:Helvetica">Se mi narri di Matematica</i><span style="font-size:0.875rem;color:rgb(0,0,0);font-family:Helvetica">,</span></div><div style="font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:medium"><div id="m_5345144255171601651gmail-:pi" style="font-size:0.875rem;direction:ltr;margin:8px 0px 0px;padding:0px"><div id="m_5345144255171601651gmail-:md" style="overflow:hidden;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:small;line-height:1.5;font-family:Arial,Helvetica,sans-serif"><div dir="ltr"><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none"><br></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">Data e ora: <b>oggi, 5 giugno 2020, ore 16:00 (ora esatta) </b></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">Speaker: <span style="white-space:pre-wrap">        </span>Christian El Emam (Università degli Studi di Pavia) </span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">Titolo: <span style="white-space:pre-wrap">        </span><i>Che forma ha un mondo perfetto? Un approccio alle varietà Riemanniane per simmetrie.</i></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">Abstract: </span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">Supponiamo di avere il potere di costruire da zero un nuovo mondo (o un nuovo universo!) in cui trasferirci. Che forma gli daremmo?  </span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">Per non scombussolare troppo il nostro concetto di mondo, supponiamo che questo nuovo mondo sia una varietà differenziabile e di metterci sopra una metrica Riemanniana, in modo da poter avere una buona nozione di lunghezze, angoli, volumi ecc.. </span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">Se gli diamo una forma particolarmente &quot;irregolare&quot;, i suoi abitanti potranno capirlo dall’interno? Come vedremo, la risposta è sì. Per non farli litigare, sarà meglio fare un universo particolarmente “regolare”. Ma come definire la regolarità?</span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">Dopo un’introduzione su alcuni concetti di base della geometria Riemanniana (come metrica, geodetiche, curvatura) ci porremo il problema di studiare due naturali richieste di regolarità che potrebbero avanzare gli abitanti di questi mondi, quali omogeneità e isotropia, e vedremo che a richiedere troppo non ci lasceranno molto margine di scelta.</span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0);min-height:17px"><span style="font-kerning:none"></span><br></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">Link Zoom: <a href="https://zoom.us/j/97469609127" target="_blank">https://zoom.us/j/97469609127</a></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none"><b>Meeting ID: 974 6960 9127</b></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none"><b>Password: 6Tu6kQ</b></span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0);min-height:17px"><span style="font-kerning:none"></span><br></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="text-decoration-line:underline;font-kerning:none">Informazioni importanti riguardo alla piattaforma multimediale</span><span style="font-kerning:none">:</span></p><ul><li style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:16.8px;line-height:normal"></span><span style="font-kerning:none">non è necessario aver installato il software di Zoom, è sufficiente accedere da browser e inserire ID e password del meeting;</span></li><li style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:16.8px;line-height:normal"></span><span style="font-kerning:none">a causa delle nuove misure di sicurezza della piattaforma Zoom, <b>è necessario inserire una password</b> per poter partecipare alla sessione;</span></li><li style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:16.8px;line-height:normal"></span><span style="font-kerning:none">nel caso in cui il meeting si interrompesse per problemi di natura tecnica, seguiranno istruzioni pubblicate sia sul sito (<a href="http://matematica.unipv.it/seminaridott/index.html" target="_blank">http://matematica.unipv.it/seminaridott/</a>), sia sulla pagina facebook (<a href="https://www.facebook.com/seminarri/" target="_blank">https://www.facebook.com/seminarri/</a>);</span></li><li style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:16.8px;line-height:normal"></span><span style="font-kerning:none">il seminario verrà registrato e il video verrà caricato sul sito. Partecipando all&#39;evento con videocamera o microfono attivi si dà il consenso ad essere registrati. Invitiamo in ogni caso a tenere entrambe le funzioni disattivate se non necessario.</span></li></ul><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">Tutte le informazioni e gli aggiornamenti si trovano anche sulla pagina web (<a href="http://matematica.unipv.it/seminaridott/index.html" target="_blank"><span style="font-kerning:none">http://matematica.unipv.it/seminaridott/</span></a>) e su quella facebook (<a href="https://www.facebook.com/seminarri/" target="_blank"><span style="font-kerning:none">https://www.facebook.com/seminarri/</span></a>).</span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none">L&#39;invito si estende a tutti gli interessati.</span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0);min-height:17px"><span style="font-kerning:none"></span><br></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none"><span style="white-space:pre-wrap">        </span>gli organizzatori</span></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"></p><p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:14px;line-height:normal;font-family:Helvetica;color:rgb(0,0,0)"><span style="font-kerning:none"><span style="white-space:pre-wrap">        </span>Mai, Christian e Federico</span></p></div></div></div></div></div>