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VI Jornadas ALAMA (English)

Laplacian and  M-matrices on  GraphsRed Alarma
2023 Barcelona
May 11-12, 2023

ILASEndorsed ILAS meeting   

VI Jornadas ALAMA: Laplacian and M-matrices in graphs

Barcelona  May 11-12, 2023

FMEVenue: Facultat de Matemàtiques i  Estadística (FME) de la Universitat Politècnica de Catalunya. Map 

Organization: ALAMA Network and Universitat Politècnica de Catalunya (UPC).

Sponsors: MICINN (Ministerio de Ciencia, Innovación y Universidades: Proyecto MTM2017-90682-REDT), Universitat Politècnica de Catalunya, Departament de Matemàtiques de la UPC, SCM Societat Catalana de Matemàtiques, SeMA (Sociedad Española de Matemática Aplicada), Red ALAMA, Fundación General Universidad de Alcalá, Ajuntament de Barcelona.

Organizing Committee: Andrés M. Encinas (, Margarida Mitjana (, Ana Marco (, María José Jiménez Jiménez (

Scientific Committee: Ángeles Carmona (), José Javier Martínez (, Raquel Viaña (

Key dates

  • March 18th: Early bird
  • March 15th: Grant application


Sponsored by:

Ministerio de Ciencia e Innovación UPC Departament de Matemàtiques

Registration:  Fill in the following registration form. In case of doubts, contact . Registration covers attendance at the conference, coffee breaks, two meals, a transport card and a cultural visit.


By March 18th

From March 19th







 *Reduced registration will apply to master's and doctoral students, as well as retired members of the ALAMA network. Those conditions will be checked during the registration process.

Accommodation: A small number of rooms are available at a very competitive price for Barcelona standards in the , right next to the FME . For this reason, we ask you to register as soon as possible  if you intend to attend the Conference.

IMPORTANT: Payment for the accommodation at ALÉU University residence must be done together with the registration. See the r.

Residence ALÉU

Rate/night (breakfast included)

Single room

77€ (VAT included)

Accommodations at your own expense may be found at booking or contact the organizers.

Registration refund. Once the registration has been formalized, if it is not possible to attend the conference, a refund of 50% of the registration fee may be requested.

Grants. The organization has some travel and/or accommodation grants  for members of the ALAMA Network with no alternative funding.

To apply for them, send an email to , with subject: ALAMA SCHOLARSHIP APPLICATION and provide the following data:

Name and surname; electronic mail; University; working group; topic of the research and estimated budget  of expenses according to legal restrictions referred to traveling and accommodation. Positive answers will be notified via the provided email. 

Food and diner: If you need any type of special food (vegetarian, vegan,  ...), please mention it during the registration process. Meals for both days are included in the registration fee and will be at a restaurant near the FME building. Registration does not include dinner on May 11th, which will be at a restaurant in the city center. The dinner can be booked,  by a €55 payment  during the registration process, which is recommended since the number of places is limited.

DESCRIPTION: The sixth ALAMA Conference will be dedicated to the study of the Laplacian and M-matrices on graphs, covering some of the recent research in this field, which is very broad. We will have both international and national researchers, half of the speakers are active members of the ALAMA network. We will deal with problems related to M-matrices and their applications in random walks, inverse problems in networks and their application to electrical impedance tomography.


Thursday May 11th

  • 09:00-09:30  Registration. Welcome session
  • 09:30-11:00  María Ángeles García Ferrero (Universitat de Barcelona) "An overview of the Calderón problem"
  • 11:00-11:30  Coffee Break
  • 11:30-12:15 Andrés M. Encinas (Universitat Politècnica de Catalunya) “M-matrices on graphs and their applications”
  • 12:15-13:00  Álvaro Samperio (Universidad de Valladolid) "Recovering piece-wise conductances on networks"
  • 13:00-14:45 Comida
  • 15:00-16:00  Ernesto Estrada (Universitat de les Illes Balears) “Spherical Euclidean matrices and effective resistance in graphs”
  • 16:00-17:00 Working session
  • 18:00-20:00 Excursion
  • 20:30 Congress diner

Friday May 12th

  • 09:00-10:30  Minerva Catral (Xavier University) "Group inverses of M-matrices and applications to Laplacians of graphs and finite Markov chains".
    • 10:30-11:00 Coffee Break
    • 11:00-12:00 Juan Manuel Peña (Universidad de Zaragoza) “Some connections between M-matrices and totally positive matrices”.
    • 12:00-12:45 Karel Devriendt (Max Planck Institute for Mathematics in the Sciences) "Matrix theory for Laplacian and effective resistance matrices".
    • 12:45-13:30 María José Jiménez (Universitat Politècnica de Catalunya) “M-matrices and random walks"
    • 13:30 -14:45 Lunch
    • 15:00-17:00 Working session
    • 17:00 Closing session