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<p class="MsoNormal"><span class="xxcontentpasted0"><span style="font-size:12.0pt;color:black">Dear colleagues, </span></span><span lang="EN-US"><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="xxcontentpasted0"><span style="font-size:12.0pt;color:black">You are cordially invited to attend the next Dutch Differential Topology and Geometry seminar, which will take place later this week in Amsterdam. </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>
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<p style="background:white"><span class="xxcontentpasted1"><b><span style="font-size:12.0pt;color:black">Speaker</span></b></span><span class="xxcontentpasted1"><span style="font-size:12.0pt;color:black">:
<a href="https://www.mathematik.hu-berlin.de/~kegemarc/" title="https://www.mathematik.hu-berlin.de/~kegemarc/">
Marc Kegel</a> </span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="xxcontentpasted1"><b><span style="font-size:12.0pt;color:black">Title</span></b></span><span class="xxcontentpasted1"><span style="font-size:12.0pt;color:black">: <i>"</i></span></span><span class="xxcontentpasted1"><i><span style="font-size:11.5pt;font-family:Helvetica;color:black">The
search for exotic knot traces</span></i></span><span class="xxcontentpasted1"><i><span style="font-size:12.0pt;color:black">" </span></i></span><span class="xxcontentpasted1"><span style="font-size:12.0pt;color:black">(see below for the abstract)</span></span><span style="color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="xxcontentpasted1"><b><span style="font-size:12.0pt;color:black">Date</span></b></span><span class="xxcontentpasted1"><span style="font-size:12.0pt;color:black">: Friday 3 November, 14:00-16:30</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p style="background:white"><span class="xxcontentpasted1"><b><span style="font-size:12.0pt;color:black">Location</span></b></span><span class="xxcontentpasted1"><span style="font-size:12.0pt;color:black">: VU Amsterdam, NU 9-A46</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>
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<p style="background:white"><span class="xxcontentpasted1"><span style="font-size:12.0pt;color:black">The schedule 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="xxcontentpasted1"><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="xxcontentpasted1"><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="xxcontentpasted1"><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="xxcontentpasted1"><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="xxcontentpasted2"><span style="font-size:12.0pt;color:black;background:white">Please notice that the first part of the seminar (2:00-3:00 p.m.) is intended for general mathematical audience, and master students with
an interest in geometry and topology are especially encouraged to participate.</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 class="xcontentpasted0" style="background:white"><span style="font-size:12.0pt;color:black">Please visit the<span class="xxcontentpasted1"> seminar</span>'s webpage for additional information and an overview of past and upcoming talks:<o:p></o:p></span></p>
<p style="background:white"><span style="font-size:12.0pt;color:black"><br>
<a href="https://www.few.vu.nl/~trt800/ddtg.html" 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 style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="xcontentpasted0" style="background:white"><span style="font-size:12.0pt;color:black">We hope to see many of you on Friday!<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 class="xcontentpasted0" style="background:white"><span style="font-size:12.0pt;color:black">Alvaro, Federica and Thomas<o:p></o:p></span></p>
<p style="background:white"><span class="xxcontentpasted1"><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 class="MsoNormal"><b><span style="color:black">Abstract</span></b><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:black">Every knot leaves a trace in the 4-dimensional world. The trace of a knot is the smooth 4-manifold obtained by attaching a 2-handle to the 4-ball along a knot in the 3-sphere. In the
first part of the talk, will carefully introduce these notions and discuss a strategy to disprove the smooth 4-dimensional Poincare conjecture by finding knot traces with certain exotic properties. The second part of the talk is devoted to certain methods
and results that might be useful to find such exotic knot traces.<o:p></o:p></span></p>
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