# Activitats

## Computational geometry seminar

Title: Illuminating polygons using edge-aligned vertex floodlights Speaker: Carlos Alegría-Galicia, Universidad Nacional Autónoma de México (UNAM) Abstract: Consider a simple polygon P with n vertices, a set of n floodlights, and an angle alpha such that, on every vertex of P lies the apex of one floodlight, all the floodlights have aperture alpha, and at least one of the bounding rays of each floodlight is aligned with an edge of P. We study the problem of finding the minimum value of alpha required to cover P. This is a joint work with David Orden, Carlos Seara, and Jorge Urrutia.
• Computational geometry seminar
• 2016-05-12T13:15:00+02:00
• 2016-05-12T14:15:00+02:00
• Title: Illuminating polygons using edge-aligned vertex floodlights Speaker: Carlos Alegría-Galicia, Universidad Nacional Autónoma de México (UNAM) Abstract: Consider a simple polygon P with n vertices, a set of n floodlights, and an angle alpha such that, on every vertex of P lies the apex of one floodlight, all the floodlights have aperture alpha, and at least one of the bounding rays of each floodlight is aligned with an edge of P. We study the problem of finding the minimum value of alpha required to cover P. This is a joint work with David Orden, Carlos Seara, and Jorge Urrutia.

Title: Illuminating polygons using edge-aligned vertex floodlights Speaker: Carlos Alegría-Galicia, Universidad Nacional Autónoma de México (UNAM) Abstract: Consider a simple polygon P with n vertices, a set of n floodlights, and an angle alpha such that, on every vertex of P lies the apex of one floodlight, all the floodlights have aperture alpha, and at least one of the bounding rays of each floodlight is aligned with an edge of P. We study the problem of finding the minimum value of alpha required to cover P. This is a joint work with David Orden, Carlos Seara, and Jorge Urrutia.

Quan
12/05/2016 de 13:15 a 14:15 (Europe/Madrid / UTC200)
On
Room S215 Omega Building, Campus Nord UPC (equiv.: Room 215 Floor -2)
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Activities are regularly announced at
http://www-ma2.upc.edu/dccg/upc-seminar-on-computational-geometry/

## Reminder: Computational geometry seminar 12-05-2016

Illuminating polygons using edge-aligned vertex floodlights Consider a simple polygon P with n vertices, a set of n floodlights, and an angle alpha such that, on every vertex of P lies the apex of one floodlight, all the floodlights have aperture alpha, and at least one of the bounding rays of each floodlight is aligned with an edge of P. We study the problem of finding the minimum value of alpha required to cover P. This is a joint work with David Orden, Carlos Seara, and Jorge Urrutia.
• Reminder: Computational geometry seminar 12-05-2016
• 2016-05-12T13:15:00+02:00
• 2016-05-12T14:15:00+02:00
• Illuminating polygons using edge-aligned vertex floodlights Consider a simple polygon P with n vertices, a set of n floodlights, and an angle alpha such that, on every vertex of P lies the apex of one floodlight, all the floodlights have aperture alpha, and at least one of the bounding rays of each floodlight is aligned with an edge of P. We study the problem of finding the minimum value of alpha required to cover P. This is a joint work with David Orden, Carlos Seara, and Jorge Urrutia.

Illuminating polygons using edge-aligned vertex floodlights Consider a simple polygon P with n vertices, a set of n floodlights, and an angle alpha such that, on every vertex of P lies the apex of one floodlight, all the floodlights have aperture alpha, and at least one of the bounding rays of each floodlight is aligned with an edge of P. We study the problem of finding the minimum value of alpha required to cover P. This is a joint work with David Orden, Carlos Seara, and Jorge Urrutia.

Quan
12/05/2016 de 13:15 a 14:15 (Europe/Madrid / UTC200)
On
Room S215 Omega Building, Campus Nord UPC (equiv.: Room 215 Floor -2)
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iCal

Activities are regularly announced at Link

## Seminari de Geometria Algebraica UPC-UB: Antoine Chambert-Loir

Antoine Chambert-Loir (Université Paris-Diderot/Institut de Mathématiques de Jussieu), A non-archimedian Ax-Lindemann theorem

Antoine Chambert-Loir (Université Paris-Diderot/Institut de Mathématiques de Jussieu), A non-archimedian Ax-Lindemann theorem

Quan
11/05/2016 des de/d' 16:00" (Europe/Madrid / UTC200)
On
Aula B1, Facultat de Matemàtiques-Edifici Històric (UB) Gran Via de Les Corts Catalanes, 585, Barcelona 08007
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Seminari de Geometria Algebraica UPC-UB Link
Antoine Chambert-Loir (Université Paris-Diderot/Institut de Mathématiques de Jussieu)

## Function Spaces Workshop

The Function Spaces Workshop which will take place next week in CRM

The Function Spaces Workshop which will take place next week in CRM

Quan
09/05/2016 des de/d' 11:00" (Europe/Madrid / UTC200)
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On May 9-11 from 11.00 to 12.00 the advanced course will be given by Jill Pipher.

Moreover, Albert Cohen, Wolfgang Dahmen, Ron DeVore, Andreas Seeger, Vladimir Temlyakov, and Tino Ullrich will give lectures from May 30 to June 3, 2016.

Finally, the program of the conference on Harmonic Analysis and Approximation Theory (HAAT 2016), from June 6 to 10, 2016, will be posted very soon.

## Workshop on Avanlanche processes in condensed matter physics and beyond

We would like to inform you that we are organizing a Worshop on Avanlanche processes in condensed matter physics and beyond, which will be held at the CRM (Barcelona), on January 9th to 13th, 2017.

We would like to inform you that we are organizing a Worshop on Avanlanche processes in condensed matter physics and beyond, which will be held at the CRM (Barcelona), on January 9th to 13th, 2017.

Quan
09/05/2016 a 13/05/2016 (Europe/Madrid / UTC200)
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The workshop is the continuation of a series of two previous meetings: “Crackling noise and intermittency in Condensed Matter Link” held in Göttingen (Germany) on May 2013 and “Avalanches in Functional Materials and Geophsyics” held in Cambridge on December 2014.
Please note that October 2nd, 2016 is the early bird deadline registration (or when seats are filled).
We hope that this information is of your interest and look forward to having you at the CRM.

Sincerely,

Álvaro Corral (Centre de Recerca Matemàtica) and Eduard Vives (Universitat de Barcelona). Organizing Comitee

## Seminari de Geometria Algebraica: Niko Naumann

May's theorem and descent up to nilpotence

May's theorem and descent up to nilpotence

Quan
06/05/2016 des de/d' 15:00" (Europe/Madrid / UTC200)
On
Divendres 6 de maig de 2015, 15 h, Aula B, Facultat de Matemàtiques-Edifici Històric (UB), Gran Via de Les Corts Catalanes, 585, Barcelona 08007
Nom de contacte
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### Descripció de l'activitat

http://www.ub.edu/sga/

Niko Naumann (Universität Regensburg)
May's theorem and descent up to nilpotence
http://www.ub.edu/sga/seminari1516/naumann.pdf

El seminari comptarà amb la participació de representants de JST Tòquio (Agència de Ciència i Tecnologia del Japó) i JSP Estrasburg (Societat Japonesa per a la Promoció de la Ciència). Data: divendres,6 maig Hora: 9:30 - 13 : 30h Lloc : Casa Àsia - Recinte Modernista Sant Pau, C / Sant Antoni Maria Claret , 165, Barcelona
• 2016-05-06T09:30:00+02:00
• 2016-05-06T13:30:00+02:00
• El seminari comptarà amb la participació de representants de JST Tòquio (Agència de Ciència i Tecnologia del Japó) i JSP Estrasburg (Societat Japonesa per a la Promoció de la Ciència). Data: divendres,6 maig Hora: 9:30 - 13 : 30h Lloc : Casa Àsia - Recinte Modernista Sant Pau, C / Sant Antoni Maria Claret , 165, Barcelona

El seminari comptarà amb la participació de representants de JST Tòquio (Agència de Ciència i Tecnologia del Japó) i JSP Estrasburg (Societat Japonesa per a la Promoció de la Ciència). Data: divendres,6 maig Hora: 9:30 - 13 : 30h Lloc : Casa Àsia - Recinte Modernista Sant Pau, C / Sant Antoni Maria Claret , 165, Barcelona

Quan
06/05/2016 de 09:30 a 13:30 (Europe/Madrid / UTC200)
On
Casa Àsia - Recinte Modernista Sant Pau, C / Sant Antoni Maria Claret , 165, Barcelona
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Inscripció prèvia imprescindible mitjançant el formulari:  Formulari

Més informació a: Info

veure la notificació sencera: Notificació

## Isabel Cristina Lopes : Time series forecasting

Seminar: Time series forecasting (Applications) Isabel Cristina Lopes Data: 4 de maig, 13:00-14:00 Lloc: Aula 18, Edifici Industrials (EUETIB)

Seminar: Time series forecasting (Applications) Isabel Cristina Lopes Data: 4 de maig, 13:00-14:00 Lloc: Aula 18, Edifici Industrials (EUETIB)

Quan
04/05/2016 de 13:00 a 14:00 (Europe/Madrid / UTC200)
On
Aula 18, Edifici Industrials (EUETIB)
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## Seminari de Geometria Algebraica UPC-UB

Seminari de Geometria Algebraica UPC-UB - Álvaro del Pino Gómez (CSIC-ICMAT), Open problems in Engel geometry - Divendres 29 d'abril, 15 h, Aula B1, Facultat de Matemàtiques, Edifici Històric, Universitat de Barcelona
• Seminari de Geometria Algebraica UPC-UB
• 2016-04-29T15:00:00+02:00
• 2016-04-29T23:59:59+02:00
• Seminari de Geometria Algebraica UPC-UB - Álvaro del Pino Gómez (CSIC-ICMAT), Open problems in Engel geometry - Divendres 29 d'abril, 15 h, Aula B1, Facultat de Matemàtiques, Edifici Històric, Universitat de Barcelona

Seminari de Geometria Algebraica UPC-UB - Álvaro del Pino Gómez (CSIC-ICMAT), Open problems in Engel geometry - Divendres 29 d'abril, 15 h, Aula B1, Facultat de Matemàtiques, Edifici Històric, Universitat de Barcelona

Quan
29/04/2016 des de/d' 15:00" (Europe/Madrid / UTC200)
On
Aula B1, Facultat de Matemàtiques, Edifici Històric, Universitat de Barcelona
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Descripció de l'activitat

Seminari de Geometria Algebraica UPC-UB
http://www.ub.edu/sga/
Álvaro del Pino Gómez (CSIC-ICMAT)

Open problems in Engel geometry http://www.ub.edu/sga/seminari1516/delpino.pdf

Divendres 29 d'abril, 15 h, Aula B1, Facultat de Matemàtiques, Edifici Històric, Universitat de Barcelona

## Computational geometry seminar 28-04-2016

Quan
28/04/2016 de 13:15 a 14:15 (Europe/Madrid / UTC200)
On
Room S215 Omega Building, Campus Nord UPC (equiv.: Room 215 Floor -2)
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Title: Graphs, hypergraphs and dominating sets
Speaker: MERCÈ MORA

Thursday, April 28, 2016, 13:15-14:15 (15 minutes delayed with respect to the usual schedule)
Room S215 Omega Building, Campus Nord UPC (equiv.: Room 215 Floor -2)

Abstract: A 'simple hypergraph' is a collection of non-comparable subsets of a set of vertices. The elements of the hypergraph are called 'hyperedges'. A graph can be viewed as a hypergraph with hyperedges of size 2.

Many concepts of graphs give rise to a collection of subsets of vertices that allows us to consider hypergraphs associated with the graph by considering the collection of minimal or maximal elements. Namely, we will handle with the collection of closed neighborhoods, dominating sets, vertex covering sets and independent sets. We study the relationships between them by using some hypergraph operations.

Finally, we focus on the case of dominating sets. A hypergraph is a 'domination hypergraph' if it is the collection of the minimal dominating sets of some graph. We are interested in determining when a hypergraph is a domination hypergraph and, if it is not the case, we seek domination hypergraphs close to it, the domination completions. Moreover, we prove that the hypergraph is univocally characterized by some domination completions, the 'minimal domination completions'.

We discuss in more detail the case of k-uniform complete 'hypergraphs', that is, hypergraphs containing all the k-subsets of a set of vertices.

Joint work with Jaume Martí-Farré and José Luis Ruiz.