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Seminario / Bier

The organising committee of the Ischia Online Group Theory Conference
(GOThIC) is inviting you to a scheduled Zoom meeting.


- The TIME OF THE TALK is 17:00 CET (CET = UTC + 1).

- You are welcome to share the Zoom link with other interested

- When joining, please MAKE SURE THAT YOUR NICKNAME
IS YOUR NAME AND SURNAME, or close to it, so that the organisers
can recognise you and let you in


The Ischia Group Theory 2020 Conference
(http://www.dipmat2.unisa.it/ischiagrouptheory/), planned
for 30 March - 4 April 2020, was postponed. In the meantime,
we are organising a series of online lectures by leading
researchers (https://sites.google.com/unisa.it/e-igt2020/).


TIME: Thursday February 25th, 2021 17:00 CET (UTC+1)

COFFEE BREAK: The talk will start at 17:00 CET.
The conference room will open at 16:45 CET for a drink
- Bring Your Own appropriate drink - biscuits appreciated -
and join us for some smalltalk before the event.


SPEAKER: Agnieszka Bier (Silesian University of Technology)

Title: On weak Sierpinski subsets in groups


Abstract:A subset E in a group G is called a weak Sierpinski subset if for some g, h in G and a different from b in E, we have gE = E \ {a} and hE = E \ {b}. In the talk we discuss the subgroup generated by g and h, and show that either it is free over (g,h) or it has presentation G(k) = <g, h | (h^{-1}g)^k>. We also characterize all weak Sierpinski subsets in the groups G(k). This is joint work with Y. Cornulier and P. Slanina.

25 febbraio 2021
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