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<title>Cohomology in algebra, geometry, physics and statistics</title>
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Wednesday, 25 March 2026 - 13:30 to 14:30 <br />
Place: Institute of Mathematics of ASCR, Žitná 25, Praha 1, the blue lecture room + ZOOM meeting
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Speaker: Aaron Kettner, Mathematical Institute, Charles University<br />
Title: $K$-theory for the $C^*$-algebra of a homeomorphism and a vector bundle
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Abstract <br />
<p>We outline how to construct a C*-algebra from a homeomorphism on a</p><p> compact Hausdorff space $X$, together with a vector bundle over $X$.</p><p> This generalizes crossed products of the form</p><p> $C(X)\rtimes_\alpha\mathbb{Z}$. Under reasonable assumptions these</p><p> $C^*$-algebras turn out to be classifiable in the sense of the Elliott</p><p> program. We sketch K-theory calculations which are work in progress with</p><p> Karen Strung and Sven Raum.</p><p><br></p><p><br></p><p>----------------------------------------------</p><p class="ql-align-justify"><br></p><p class="ql-align-justify"><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);">We shall open the seminar room + ZOOM meeting at 13.15 for coffee and close ZOOM at 15.00</span></p><p class="ql-align-justify"><br></p><p class="ql-align-justify"><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);">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=YXNFbk50aVhleXhWSGtISFViLytRUT09" rel="noopener noreferrer" target="_blank" style="background-color: rgb(255, 255, 255); color: rgb(17, 85, 204);">https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRUT09</a></p><p class="ql-align-justify"><br></p><p class="ql-align-justify"><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);">Meeting ID:99598413922</span></p><p class="ql-align-justify"><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);">Passcode:Galois</span></p><p class="ql-align-justify"><br></p><p class="ql-align-justify"><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);">--------------------------------------------------</span></p><p class="ql-align-justify"><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);">On Wednesday April 1, </span>Elizaveta Vishnyakova sahll give a talk</p><p class="ql-align-justify"><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);"> </span><a href="https://www.math.cas.cz/index.php/events/event/4136" rel="noopener noreferrer" target="_blank"> About Graded coverings of supermanifolds and their applications </a></p><p>The seminar shall <strong>start earlier at 13:00</strong>.</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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