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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">A reminder for this Friday.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Best,<br>
Thomas<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">From:
</span></b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">"Rot, T.O. (Thomas)" <t.o.rot@vu.nl><br>
<b>Date: </b>Wednesday, 25 September 2024 at 14:46<br>
<b>To: </b>"Topology.beta" <mailman-bounces@listserver.vu.nl><br>
<b>Subject: </b>DDT&G 4th of october.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-ligatures:none"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">To celebrate world animal day we invited Leopold Zoller to speak about Massey Products and Formal domination. The event is in Amsterdam<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">We’ll go for dinner afterwards. Let me know if you want to join.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Thomas<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">04-10-2024: 14:30-1</span></b><b><span lang="EN-US" style="font-size:11.0pt">7</span></b><b><span style="font-size:11.0pt">:00 location
</span></b><b><span lang="EN-US" style="font-size:11.0pt">Amsterdam: Maryam (NU 9<sup>th</sup> floor)</span></b><b><span style="font-size:11.0pt">: <a href="https://www.mi.uni-koeln.de/~lzoller/">Leopold Zoller </a>: Massey Products and formal domination<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Abstract: The singular cochain algebra of a space contains a lot of information beyond the cohomology algebra. A key technique in rational homotopy theory is to replace the singular cochains by smaller models
in order to make that information visible. In the first talk, we will give an example driven introduction to some techniques from rational homotopy theory such as Sullivan models of spaces. These will then be used to study certain higher operations on the
cohomology algebra called Massey products. In particular we will encounter formal spaces, which can be understood as those spaces with vanishing higher operations.</span><span lang="EN-US" style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">In the second talk we will study the behaviour of Massey products under the relation of domination: if there is a map of nonzero degree between two compact manifolds, then we say that the source dominates
the target. There is a general heuristic in geometry that the dominated manifold is "simpler" than the source. We show that this turns out to be true in the realm of rational homotopy theory when interpreting simplicity as the vanishing of higher operations.
This is based on joint work with Jonas Stelzig and Aleksandar Milivojevic.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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