From phk_seminar_announcement at math.cas.cz  Mon Oct  7 13:00:02 2024
From: phk_seminar_announcement at math.cas.cz (phk_seminar_announcement at math.cas.cz)
Date: Mon, 07 Oct 2024 11:00:02 +0000
Subject: [PHK_seminar] [Cohomology]Wednesday 9 Oct,  Maxim Grigoriev
Message-ID: <33758f12298ebfb15301780155821673@math.cas.cz>

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From somberg at karlin.mff.cuni.cz  Wed Oct  9 10:46:29 2024
From: somberg at karlin.mff.cuni.cz (Petr Somberg)
Date: Wed, 9 Oct 2024 10:46:29 +0200
Subject: [PHK_seminar]  [Cohomology]Wednesday 9 Oct,  Maxim Grigoriev
In-Reply-To: <33758f12298ebfb15301780155821673@math.cas.cz>
References: <33758f12298ebfb15301780155821673@math.cas.cz>
Message-ID: <195.113.30.248.1051.5421dfee1a8cb15826da2eb8ab368fe7.squirrel@webmail.karlin.mff.cuni.cz>


 This is just a remainder of our seminar for today!

=====================================================================

> Cohomology in algebra, geometry, physics and statistics
> Wednesday 9 October 2024 - 13:30 to 14:30
> Place: ZOOM metting
>
>
> Speaker: Maxim Grigoriev, Mons University
> Title: Graded geometry of local gauge theories
> Abstract
>
>
> Gauge PDEs generalize AKSZ sigma models to the case of general local
> gauge theories. Despite being very flexible and invariant these
> geometrical objects are usually infinite-dimensional and are difficult to
> define explicitly, just like standard infinitely-prolonged PDEs. We
> propose a notion of a weak gauge PDE where the nilpotency of the BRST
> differential is relaxed in a controllable way. In this approach a
> nontopological local gauge theory can be described in terms of a
> finite-dimensional geometrical object. Moreover, among such objects one
> can find a minimal one which is unique in a certain sense. In the case of
> a Lagrangian system, the respective weak gauge PDE naturally arises from
> the presymplectic structure. We prove that any weak gauge PDE determines
> the standard jet-bundle BV formulation of the underlying gauge theory,
> giving an unambiguous field-theoretical interpretation of these objects.
> The relation to the covariant phase space and the multisymplectic
> approaches is also discussed. The formalism is illustrated by a variety
> of models including (super) gravity, (chiral) Yang-Mills, and a
> non-Lagrangian self-dual Yang-Mills theory.
>
>
>
>
> _________________________________________________________________________
> _____________
>
>
>
>
>
> We shall open ZOOM at 13.15 for  veritual coffee and close the room at
> 15:00
>
>
>
>
>
> Join Zoom Meeting
>
>
>
>
>
> https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU9
>
>
>
>
>
> MeetingID:99598413922
>
>
>
>
>
> Passcode:Galois
>
>
>
> For more information see the seminar web page at
> https://www.math.cas.cz/index.php/events/seminar/16
>
>
> Cohomology in algebra, geometry, physics and statistics mailing list
> phk_seminar at math.cas.cz
> https://list.math.cas.cz/listinfo/phk_seminar at math.cas.cz
> _______________________________________________
> phk_seminar mailing list phk_seminar at math.cas.cz
> https://list.math.cas.cz/listinfo/phk_seminar
>
>



From khavkine at math.cas.cz  Thu Oct 10 21:56:44 2024
From: khavkine at math.cas.cz (Igor Khavkine)
Date: Thu, 10 Oct 2024 21:56:44 +0200
Subject: [PHK_seminar] [Cohomology]Wednesday 2 Oct, Alexei Kotov
In-Reply-To: <37117f53c52ba757434f3dcff0b042c5@math.cas.cz>
References: <37117f53c52ba757434f3dcff0b042c5@math.cas.cz>
Message-ID: <7711671d-f454-4827-9e02-37ea462e588a@math.cas.cz>

Dear All,

The video recording of the talk by Alexei Kotov from last week is now 
available on YouTube at

   https://youtu.be/DkvjR9BzXJs

This link has also been recorded at the ResearchSeminars announcement

   https://researchseminars.org/talk/PHK-cohomology-seminar/109/

Best,

Igor


On 9/30/24 1:00 PM, sender of seminar announcement via phk_seminar wrote:
> Wednesday, 2 October 2024 - 13:30 to 14:30
> Place: Institute of Mathematics of ASCR, ?itn? 25, Praha 1, the blue 
> lecture room + ZOOM meeting
> 
> Speaker: Alexei Kotov, University of Hradec Kralove
> Title: Graded super Hopf algebroids
> 
> Abstract
> 
> The talk will be focused on Hopf algebras and algebroids in the category 
> of Z-graded varieties. The theory of Harish-Chandra pairs will be 
> briefly discussed and their generalization to action algebroids will be 
> presented.
> 
> 
> -----------------------------------------------------------------------------------------------
> 
> We shall open the seminar room + ZOOM at 13.15 for coffee and close the 
> room at 15:00
> 
> 
> Join Zoom Meeting
> 
> 
> https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU 
> <https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRUT09>9
> 
> 
> MeetingID:99598413922
> 
> 
> Passcode:Galois
> 
> For more information see the seminar web page at
> https://www.math.cas.cz/index.php/events/seminar/16
> 
> Cohomology in algebra, geometry, physics and statistics mailing list
> phk_seminar at math.cas.cz
> https://list.math.cas.cz/listinfo/phk_seminar at math.cas.cz
> 
> 
> _______________________________________________
> phk_seminar mailing list
> phk_seminar at math.cas.cz
> https://list.math.cas.cz/listinfo/phk_seminar

From khavkine at math.cas.cz  Thu Oct 10 21:57:02 2024
From: khavkine at math.cas.cz (Igor Khavkine)
Date: Thu, 10 Oct 2024 21:57:02 +0200
Subject: [PHK_seminar] [Cohomology]Wednesday 9 Oct, Maxim Grigoriev
In-Reply-To: <195.113.30.248.1051.5421dfee1a8cb15826da2eb8ab368fe7.squirrel@webmail.karlin.mff.cuni.cz>
References: <33758f12298ebfb15301780155821673@math.cas.cz>
	<195.113.30.248.1051.5421dfee1a8cb15826da2eb8ab368fe7.squirrel@webmail.karlin.mff.cuni.cz>
Message-ID: <06d2462e-e8a8-4c9d-89c3-375eaff1b203@math.cas.cz>

Dear All,

The video recording of the talk by Maxim Grigoriev from this week is now 
available on YouTube at

   https://youtu.be/ArF_TD2TI34

The slides of the talk are available from

   https://users.math.cas.cz/~hvle/PHK/Grigoriev2024.pdf

These links have also been recorded at the ResearchSeminars announcement

   https://researchseminars.org/talk/PHK-cohomology-seminar/110/

Best,

Igor

On 10/9/24 10:46 AM, Petr Somberg via phk_seminar wrote:
> 
>   This is just a remainder of our seminar for today!
> 
> =====================================================================
> 
>> Cohomology in algebra, geometry, physics and statistics
>> Wednesday 9 October 2024 - 13:30 to 14:30
>> Place: ZOOM metting
>>
>>
>> Speaker: Maxim Grigoriev, Mons University
>> Title: Graded geometry of local gauge theories
>> Abstract
>>
>>
>> Gauge PDEs generalize AKSZ sigma models to the case of general local
>> gauge theories. Despite being very flexible and invariant these
>> geometrical objects are usually infinite-dimensional and are difficult to
>> define explicitly, just like standard infinitely-prolonged PDEs. We
>> propose a notion of a weak gauge PDE where the nilpotency of the BRST
>> differential is relaxed in a controllable way. In this approach a
>> nontopological local gauge theory can be described in terms of a
>> finite-dimensional geometrical object. Moreover, among such objects one
>> can find a minimal one which is unique in a certain sense. In the case of
>> a Lagrangian system, the respective weak gauge PDE naturally arises from
>> the presymplectic structure. We prove that any weak gauge PDE determines
>> the standard jet-bundle BV formulation of the underlying gauge theory,
>> giving an unambiguous field-theoretical interpretation of these objects.
>> The relation to the covariant phase space and the multisymplectic
>> approaches is also discussed. The formalism is illustrated by a variety
>> of models including (super) gravity, (chiral) Yang-Mills, and a
>> non-Lagrangian self-dual Yang-Mills theory.
>>
>>
>>
>>
>> _________________________________________________________________________
>> _____________
>>
>>
>>
>>
>>
>> We shall open ZOOM at 13.15 for  veritual coffee and close the room at
>> 15:00
>>
>>
>>
>>
>>
>> Join Zoom Meeting
>>
>>
>>
>>
>>
>> https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU9
>>
>>
>>
>>
>>
>> MeetingID:99598413922
>>
>>
>>
>>
>>
>> Passcode:Galois
>>
>>
>>
>> For more information see the seminar web page at
>> https://www.math.cas.cz/index.php/events/seminar/16
>>
>>
>> Cohomology in algebra, geometry, physics and statistics mailing list
>> phk_seminar at math.cas.cz
>> https://list.math.cas.cz/listinfo/phk_seminar at math.cas.cz
>> _______________________________________________
>> phk_seminar mailing list phk_seminar at math.cas.cz
>> https://list.math.cas.cz/listinfo/phk_seminar
>>
>>
> 
> 
> _______________________________________________
> phk_seminar mailing list
> phk_seminar at math.cas.cz
> https://list.math.cas.cz/listinfo/phk_seminar
> 

From phk_seminar_announcement at math.cas.cz  Mon Oct 14 13:00:02 2024
From: phk_seminar_announcement at math.cas.cz (phk_seminar_announcement at math.cas.cz)
Date: Mon, 14 Oct 2024 11:00:02 +0000
Subject: [PHK_seminar] [Cohomology]Wednesday 16 Oct,  Michal Doucha
Message-ID: <7f97cfafe597af21afb3b25882198835@math.cas.cz>

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From somberg at karlin.mff.cuni.cz  Wed Oct 16 10:55:00 2024
From: somberg at karlin.mff.cuni.cz (Petr Somberg)
Date: Wed, 16 Oct 2024 10:55:00 +0200
Subject: [PHK_seminar]  [Cohomology]Wednesday 16 Oct,  Michal Doucha]
Message-ID: <195.113.30.248.1051.900e47498a542b455aad40b377b5920c.squirrel@webmail.karlin.mff.cuni.cz>


 This is just the remainder of our seminar starting soon.

==========================================================================

     Cohomology in algebra, geometry, physics and statistics




         Wednesday, 16 October 2024 - 13:30 to 14:30

         Place: Institute of Mathematics of ASCR, ?itn? 25, Praha 1,
KONIRKA in the front building  + ZOOM meeting




         Speaker: Michal Doucha, Institute of Mathematics of ASCR

         Title: Shadowing of actions of hyperbolic groups on their boundaries



         Abstract


I will give a quick introduction to general Gromov hyperbolic metric
spaces, in particular hyperbolic groups, and their boundaries. A very
useful way of studying hyperbolic groups is via their canonical actions on
their boundaries. I will discuss a very recent result of K. Mann et al
that such actions are topologically stable (although this was apparently
hinted by Gromov in his paper on hyperbolic groups from 1987) and present
my result that these actions in fact have the so-called shadowing (a.k.a.
pseudo-orbit tracing) property, which implies the topological stablity as
a corollary.
-----------------------------------------------------------------------------------------------
We shall open the seminar room + ZOOM at 13.15 for coffee and close the
room at 15:00


Join Zoom Meeting


https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU9


MeetingID:99598413922
Passcode:Galois











          For more information see the seminar web page at

          https://www.math.cas.cz/index.php/events/seminar/16




         Cohomology in algebra, geometry, physics and statistics mailing list

         phk_seminar at math.cas.cz

         https://list.math.cas.cz/listinfo/phk_seminar at math.cas.cz





 _______________________________________________
phk_seminar mailing list
phk_seminar at math.cas.cz
https://list.math.cas.cz/listinfo/phk_seminar



From khavkine at math.cas.cz  Thu Oct 17 09:45:51 2024
From: khavkine at math.cas.cz (Igor Khavkine)
Date: Thu, 17 Oct 2024 09:45:51 +0200
Subject: [PHK_seminar] [Cohomology]Wednesday 16 Oct, Michal Doucha
In-Reply-To: <7f97cfafe597af21afb3b25882198835@math.cas.cz>
References: <7f97cfafe597af21afb3b25882198835@math.cas.cz>
Message-ID: <238276f3-f3a8-4299-978e-ae2d8113d41b@math.cas.cz>

Dear All,

The video recording of the talk by Michal Doucha from this week is now 
available on YouTube at

   https://youtu.be/VVZuqNa1Yl8

This link has also been recorded at the ResearchSeminars announcement

   https://researchseminars.org/talk/PHK-cohomology-seminar/111/

Best,

Igor


On 10/14/24 1:00 PM, sender of seminar announcement via phk_seminar wrote:
> Wednesday, 16 October 2024 - 13:30 to 14:30
> Place: Institute of Mathematics of ASCR, ?itn? 25, Praha 1, KONIRKA in 
> the front building + ZOOM meeting
> 
> Speaker: Michal Doucha, Institute of Mathematics of ASCR
> Title: Shadowing of actions of hyperbolic groups on their boundaries
> 
> Abstract
> 
> I will give a quick introduction to general Gromov hyperbolic metric 
> spaces, in particular hyperbolic groups, and their boundaries. A very 
> useful way of studying hyperbolic groups is via their canonical actions 
> on their boundaries. I will discuss a very recent result of K. Mann et 
> al that such actions are topologically stable (although this was 
> apparently hinted by Gromov in his paper on hyperbolic groups from 1987) 
> and present my result that these actions in fact have the so-called 
> shadowing (a.k.a. pseudo-orbit tracing) property, which implies the 
> topological stablity as a corollary.
> 
> -----------------------------------------------------------------------------------------------
> 
> We shall open the seminar room + ZOOM at 13.15 for coffee and close the 
> room at 15:00
> 
> 
> Join Zoom Meeting
> 
> 
> https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU 
> <https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRUT09>9
> 
> 
> MeetingID:99598413922
> 
> Passcode:Galois
> 
> 
> 
> For more information see the seminar web page at
> https://www.math.cas.cz/index.php/events/seminar/16
> 
> Cohomology in algebra, geometry, physics and statistics mailing list
> phk_seminar at math.cas.cz
> https://list.math.cas.cz/listinfo/phk_seminar at math.cas.cz
> 
> 
> _______________________________________________
> phk_seminar mailing list
> phk_seminar at math.cas.cz
> https://list.math.cas.cz/listinfo/phk_seminar

From phk_seminar_announcement at math.cas.cz  Mon Oct 28 13:00:01 2024
From: phk_seminar_announcement at math.cas.cz (phk_seminar_announcement at math.cas.cz)
Date: Mon, 28 Oct 2024 12:00:01 +0000
Subject: [PHK_seminar] =?utf-8?q?=5BCohomology=5DWednesday_30_Oct=2C_?=
 =?utf-8?b?xaB0xJtww6FuICBIb2x1Yg==?=
Message-ID: <2388b5aac8cb9813d8b8f6cdae5bba80@math.cas.cz>

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From somberg at karlin.mff.cuni.cz  Wed Oct 30 10:44:47 2024
From: somberg at karlin.mff.cuni.cz (Petr Somberg)
Date: Wed, 30 Oct 2024 10:44:47 +0100
Subject: [PHK_seminar] =?utf-8?q?=5BCohomology=5DWednesday_30_Oct=2C_?=
 =?utf-8?b?xaB0xJtww6FuICBIb2x1Yg==?=
In-Reply-To: <2388b5aac8cb9813d8b8f6cdae5bba80@math.cas.cz>
References: <2388b5aac8cb9813d8b8f6cdae5bba80@math.cas.cz>
Message-ID: <195.113.30.248.1051.e482bbd3b0ed1a64b57ba7ca5b5146f1.squirrel@webmail.karlin.mff.cuni.cz>


 This is just a reminder of our seminar starting at 13.30!

==========================================================

> Cohomology in algebra, geometry, physics and statistics
> Wednesday, 30 October 2024 - 13:30 to 14:30
> Place: Institute of Mathematics of ASCR, ?itn? 25, Praha 1, the  blue
> lecture  room  +ZOOM meeting
>
> Speaker: ?t?p?n Holub, Charles University
> Title: Combinatorics on Words in Isabelle/HOL
> Abstract
>
>
> Wednesday, 27 November 2024 - 13:30 to 14:30 Institute of Mathematics of
> ASCR, ?itn? 25, Praha 1, the blue lecture room + ZOOM meeting
>
>
> The talk will present the ongoing project of formalization of
> combinatorics on words in the computer proof assistant Isabelle/HOL.
> Independently of the particular formalized topic, the talk will attempt
> to serve as an introduction to Isabelle/HOL for beginners.
>
> ?
>
>
> -------------------------------------------------------------------------
> ---------------------
>
>
> We shall open the seminar room + ZOOM at 13.15 for coffee and close the
> room at 15:00
>
>
>
>
> Join Zoom Meeting
>
>
>
>
>
> https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU9
>
>
>
>
>
> MeetingID:99598413922
> Passcode:Galois
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> For more information see the seminar web page at
> https://www.math.cas.cz/index.php/events/seminar/16
>
>
> Cohomology in algebra, geometry, physics and statistics mailing list
> phk_seminar at math.cas.cz
> https://list.math.cas.cz/listinfo/phk_seminar at math.cas.cz
> _______________________________________________
> phk_seminar mailing list phk_seminar at math.cas.cz
> https://list.math.cas.cz/listinfo/phk_seminar
>
>



