Jornadas PEI 2017

4th ALAMA Workshop: Inverse Spectral Problems

Jornadas PEI 2017

Madrid (Spain), June 15th-16th 2017

Venue: Centro Asociado de la Uned, Escuelas Pías, Madrid.

Organized by: Red ALAMA and Universidad Nacional de Educación a Distancia (UNED).

Funding: MINECO (Ministerio de Economía, Industria y Competitividad: Proyecto MTM2015-68805-REDT) y Dpto. de Matemáticas Fundamentales de la UNED.

Organizers: Alberto Borobia ( and Roberto Canogar (, with support by Ion Zaballa (Universidad del País Vasco).

Inscription (no fee): to access the inscription form go to the following link. When you fill the form you recieve an automatic email with the confirmation and a link in case you what to change any answer.

Hotels near the venue: Here is a list of 12 hotels/hostels.


There are five sholarships for graduate students: These scholarships are only available for graduate students that belong to one of the groups of the Research Panel of the ALAMA network (that is, the groups of Ion Zaballa, Pedro Alonso, Carlos Beltrán, Alberto Borobia, Miguel Carriegos, Josep Ferrer, Froilán M. Dopico, José Mas, Juan Manuel Peña, Néstor Thome). Go to the Spanish page for more details

Lunch and dinner: Lunch of Thursday will be in restaurant very close to the venue (Finocchio) and will be financed by the organicers. The social dinner on Thursday will be held in restaurante La Entretenida with a nice menu for groups that will cost 45€. For any special eating requirements (vegeterians, vegan, celiac, etc) please inform us on arival to the workshop.


The 4th ALAMA Workshop will focus in Inverse Spectral Problems. These are problems that study the existence and construction of matrices with prescribed spectral or structural properties. The main objective of this workshop is to have talks that introduce these topics for member of the ALAMA network. On Thursday all talks will be devoted to the NonNegative Inverse Eigenvalue Problem, and Friday will cover other topics like Completion Problems and Inverse Problems for Matrix Polynomials.


Thursday June 15th (NonNegative Inverse Eigenvalue Problem, NIEP)

  • 10:00 Registry and Welcome
  • 10:30-11:30 Raphael Loewy (Israel Institute of Technology, Israel):
        "An overview of the Nonnegative Inverse Eigenvalue Problem"
  • 11:30-12:00 Coffee Break
  • 12:00-13:00 Miriam Pisonero (Universidad de Valladolid):
        “Map of the sufficient conditions
  • 13:00-14:00 Julio Moro (Universidad Carlos III de Madrid):
        “Compensation of negativity in the Nonnegative Inverse Eigenvalue Problem”.
  • 14:00-16:00 Luch
  • 16:00-17:00 Ricardo Soto (Universidad Católica Norte, Chile):
        “Constructing examples”.
  • 17:00-18:00 Alberto Borobia (UNED):
        "The NIEP is NP-hard"
  • 18:00-18:30 Coffee Break
  • 18:30-19:30 Carlos Marijuan (Universidad de Valladolid):
        "Open problems in the NIEP"
  • 19:30-21:30 Free Time (the visit to the M.C. Escher exhibition has been canceled).
  • 21:30 Dinner

Friday June 16th (Other topics: Matrix Completion and Matrix Polynomials)

  • 10:00-11:00 Roberto Canogar (UNED):
        "Matrix completion problems"
  • 11:00-11:30 Coffee Break
  • 11:30-12:30 Ion Zaballa (Universidad del País Vasco):
        “The inverse problem for real and symmetric quadratic matrix polynomials
  • 12:30-13:30 Marija Dodig (Universidad de Lisboa):
        “New developments in matrix pencils completion problems
  • 13:30 Closing