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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:12.0pt">Renee is speaking!<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt"><o:p> </o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Federica Pasquotto <f.pasquotto@math.leidenuniv.nl><br>
<b>Date: </b>Tuesday, 15 November 2022 at 16:59<br>
<b>To: </b>Federica Pasquotto <f.pasquotto@math.leidenuniv.nl><br>
<b>Subject: </b>DDT&G seminar on Friday in Leiden<o:p></o:p></span></p>
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<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">Dear all,</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">You are kindly invited to attend this week's Dutch Differential Topology and Geometry seminar:</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><b><span style="font-size:12.0pt;color:black">Speaker</span></b></span><span class="contentpasted0"><span style="font-size:12.0pt;color:black">: Renee Hoekzema (VU)</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><b><span style="font-size:12.0pt;color:black">Title</span></b></span><span class="contentpasted0"><span style="font-size:12.0pt;color:black">: <i>"</i></span></span><span class="contentpasted0"><i><span style="font-size:11.5pt;font-family:Helvetica;color:black">Manifolds
with odd Euler characteristics and higher orientability</span></i></span><span class="contentpasted0"><i><span style="font-size:12.0pt;color:black">"</span></i></span><i><span style="font-size:12.0pt;color:black">. </span></i><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><b><span style="font-size:12.0pt;color:black">Date</span></b></span><span class="contentpasted0"><span style="font-size:12.0pt;color:black">: Friday 18 November, 14:00</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><b><span style="font-size:12.0pt;color:black">Location</span></b></span><span class="contentpasted0"><span style="font-size:12.0pt;color:black">: Mathematical Institute, Leiden, room 405 (Snellius building) </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">Please see below for a more detailed description of the seminar's content.</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black;background:white">It will also be possible to follow the seminar <i>online
</i>using the login details below:</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black;background:white"><a href="https://us06web.zoom.us/j/84140801909" target="_blank">https://us06web.zoom.us/j/84140801909</a></span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Meeting ID: 841 4080 1909<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Passcode: 978217<o:p></o:p></span></p>
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<p style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">We would like to remind you that master students with an interest in topology and geometry are strongly encouraged to participate.</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">The schedule for all participants will be as follows:</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">2:00-3:00 p.m.: first part of the seminar (little to no prior knowledge assumed)</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">3:30-4:30 p.m.: second part of the seminar (slightly more advanced level)</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">Please visit the seminar's webpage for additional information and an overview of past and upcoming talks:</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span style="font-size:12.0pt;color:black"><a href="https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.few.vu.nl%2F~trt800%2Fddtg.html&data=05%7C01%7Cf.pasquotto%40math.leidenuniv.nl%7C4938465b710f4073cf6308dabd8b9bbe%7Cca2a7f76dbd74ec091086b3d524fb7c8%7C0%7C0%7C638030704547579424%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Lxc1yNMV5PkcMiweMavAGgm3Vp7Yu8hqk0w79cj9vYg%3D&reserved=0" target="_blank" title="Original URL: https://www.few.vu.nl/~trt800/ddtg.html. Click or tap if you trust this link.">https://www.few.vu.nl/~trt800/<span style="color:#070706;background:#FFEE94">ddt</span>g.html</a><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">We would also like to remind you that the previous lectures are available on the youtube channel of the seminar: </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span style="font-size:12.0pt;color:black"><a href="https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtube.com%2Fchannel%2FUCN0o3PUqaC_ZhPNuM846kgg%2F&data=05%7C01%7Cf.pasquotto%40math.leidenuniv.nl%7C4938465b710f4073cf6308dabd8b9bbe%7Cca2a7f76dbd74ec091086b3d524fb7c8%7C0%7C0%7C638030704547579424%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=%2BARMEjR8Enc7vBZrgpDUcW62uuP96I0CTuY1r8LaX2A%3D&reserved=0" target="_blank" title="Original URL: https://www.youtube.com/channel/UCN0o3PUqaC_ZhPNuM846kgg/. Click or tap if you trust this link.">https://www.youtube.com/channel/UCN0o3PUqaC_ZhPNuM846kgg/</a><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">We hope to see many of you on Friday!</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black">Alvaro, Federica, Rob, and Thomas.</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="contentpasted0"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><b><span style="font-size:12.0pt;color:black">Abstract:</span></b><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">I will give an introduction to Steenrod squares and the classical Hopf invariant one problem. Then I will talk about a generalisation of the classical theorem that orientable
manifolds have even Euler characteristic unless the dimension is a multiple of 4. This generalization to higher orientable manifolds leads to a new open problem that extends the Hopf invariant one problem.<o:p></o:p></span></p>
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