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[K-OS] Knot Online Seminar

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The Zoom password consists of the birth date (in format DDMMYYYY) of the mathematician whose name is usually associated to the duality between homology and cohomology of closed oriented manifolds. The Zoom password is also contained in the email notification (subscribe below).

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Frühjahrssemester 2025

Datum / Zeit Referent:in Titel Ort
20. Februar 2025
16:15-17:15 		Dr. Miguel Orbegozo Rodriguez
ETH Zurich, Switzerland
Details

[K-OS] Knot Online Seminar

Titel Homogeneous braids are visually prime
Referent:in, Affiliation Dr. Miguel Orbegozo Rodriguez, ETH Zurich, Switzerland
Datum, Zeit 20. Februar 2025, 16:15-17:15
Ort online
Abstract For which link diagrams can we tell, simply with the 2-dimensional diagram information, whether the associated link is prime? Menasco showed that we can for alternating diagrams, and Cromwell, for positive braids. The latter further conjectured that the same would hold for any diagram for which Seifert's algorithm yields a minimal genus surface. This minimality property, if we also required that the diagram be a braid closure, is equivalent to the braid being homogeneous. Since these links are fibered, we can use open book techniques. I will present a criterion for how primeness of fibered links behaves under an operation called Murasugi sums, which we consider to be of independent interest; and explain how we can use it to prove Cromwell's conjecture for braid closures, i.e. for homogeneous braids. This is joint work with Peter Feller and Lukas Lewark.
Homogeneous braids are visually primeread_more
online
20. März 2025
16:15-17:15 		Patricia Cahn
Smith College
Details

[K-OS] Knot Online Seminar

Titel Rep-Tiles
Referent:in, Affiliation Patricia Cahn, Smith College
Datum, Zeit 20. März 2025, 16:15-17:15
Ort online
Rep-Tiles
online
17. April 2025
16:15-17:15 		Jae Choon Cha
POSTECH
Details

[K-OS] Knot Online Seminar

Titel Calegari's homotopy 4-spheres from fibered knots are standard
Referent:in, Affiliation Jae Choon Cha, POSTECH
Datum, Zeit 17. April 2025, 16:15-17:15
Ort online
Calegari's homotopy 4-spheres from fibered knots are standard
online

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