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<title>Cohomology in algebra, geometry, physics and statistics</title>
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Wednesday, 23 April 2025 - 13:30 to 14:30 <br />
Place: Institute of Mathematics of ASCR, Žitná 25, Praha 1, ZOOM meeting
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Speaker: Giles Gardam, University of Bonn<br />
Title: The Kaplansky conjectures
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Abstract <br />
<p><span style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);" class="ql-font-monospace">There is a series of four long-standing conjectures on group rings that are attributed to Kaplansky. For example, the zero divisor conjecture states that the group ring of a torsion-free group over a field has no zero divisors. I will discuss what is known about these conjectures and my disproof of the unit conjecture.</span></p><p class="ql-align-justify"><span style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);" class="ql-font-monospace">---</span><span style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);">-------------------------------------------------------------------------------------------------------------------------</span></p><p class="ql-align-justify"><br></p><p class="ql-align-justify"><span style="background-color: rgb(246, 246, 246); color: rgb(0, 0, 255);" class="ql-font-monospace">We shall open the ZOOM meeting at 13.15 for coffee and close it at 15:00</span></p><p class="ql-align-justify"><br></p><p class="ql-align-justify"><span style="background-color: rgb(246, 246, 246); color: rgb(0, 0, 255);" class="ql-font-monospace">Join Zoom Meeting</span></p><p class="ql-align-justify"><br></p><p class="ql-align-justify"><a href="https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU9" rel="noopener noreferrer" target="_blank" style="background-color: transparent; color: rgb(0, 0, 204);" class="ql-font-monospace">https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU9</a></p><p class="ql-align-justify"><br></p><p class="ql-align-justify"><span style="background-color: rgb(246, 246, 246); color: rgb(0, 0, 255);" class="ql-font-monospace">MeetingID:99598413922</span></p><p class="ql-align-justify"><br></p><p class="ql-align-justify"><span style="background-color: rgb(246, 246, 246); color: rgb(0, 0, 255);" class="ql-font-monospace">Passcode:Galois</span></p><p><br></p><p>-----------------------------------------------------------------------------------------------------------------------</p><p><br></p><p>On the next Wednesday April 30, <strong>Malkhaz Bakuradze, </strong>Iv. Javakhishvili Tbilisi State University, shall continue his lecture <strong>The transfer and Symplectic Cobordism II</strong></p><p>https://www.math.cas.cz/index.php/events/event/3887</p><p><br></p><p><br></p>
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For more information see the seminar web page at <br />
https://www.math.cas.cz/index.php/events/seminar/16
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Cohomology in algebra, geometry, physics and statistics mailing list <br />
phk_seminar@math.cas.cz <br />
https://list.math.cas.cz/listinfo/phk_seminar@math.cas.cz
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