Boletín Nº 230
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Boletín del IMI
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In today's Director's Message, I simply wanted to pay tribute to Prof. Per Enflo, a close collaborator of the Institute and IMI Honorary Professor in 2023. All of us deeply mourn his recent passing and express our most sincere condolences to his family, friends, and colleagues. Rest in peace, Per.
Gustavo Adolfo Muñoz Fernández
24 de Septiembre de 2026. Ha tenido lugar el acto de recepción del investigador del IMI Juan Seoane como académico correspondiente de la Real Academia de Ciencias Exactas, Físicas y Naturales de España. La designación de Juan supone un reconocimiento a una carrera científica de primer nivel, caracterizada por una actividad investigadora sostenida y por resultados de notable relevancia internacional. Sus contribuciones han enriquecido diversos campos de las matemáticas, entre ellos el Análisis Funcional, la Teoría de Operadores y el Análisis Real, además de impulsar significativamente el estudio de la lineabilidad y de las propiedades algebraicas asociadas a conjuntos de comportamiento singular. Asimismo, su labor investigadora ha dejado una huella destacada en áreas como la teoría de espacios de Banach y la geometría de los espacios de polinomios. En el IMI celebramos con especial satisfacción esta distinción, que reconoce una trayectoria marcada por el rigor, la creatividad y la excelencia académica. Queremos expresar a Juan nuestra más cálida felicitación por este importante logro, plenamente merecido y reflejo de la calidad de su trabajo científico.
Seoane Sepúlveda y Jesús Ildefonso Díaz Díaz
28 September 2026. The Interdisciplinary Mathematics Institute (IMI) is deeply saddened by the passing of Professor Per H. Enflo. A mathematician of exceptional originality and international stature, Per was appointed Honorary Professor of the IMI in 2023 and maintained close ties with the Institute through his collaborations with several of its members.
His landmark contributions to functional analysis, including his celebrated work on the invariant subspace problem and other longstanding questions in Banach space theory, have shaped decades of research. His work stands as a testament to the power of independent thought, perseverance, and a willingness to explore beyond established approaches. His legacy extends far beyond the problems he resolved: his ideas continue to inspire new work and open new directions of research, not only in mathematics but also across many other fields of science.
For those of us who had the privilege of knowing and working with Per, this loss is also deeply personal. Alongside his extraordinary mathematical achievements, we will remember the conversations, the ideas we exchanged, and the friendship we shared. We are grateful for the time we had with him and for all that he contributed to our academic community. His presence will be deeply missed, and his influence will endure in the work and lives of those he inspired.
We extend our heartfelt condolences to his family, friends, colleagues, and former students, and join them in remembering him with affection, gratitude, and profound respect.
The world has lost an extraordinary mathematician, and we have lost a dear friend.
Gustavo A. Muñoz Fernández and Juan B. Seoane Sepúlveda
Prof. Per Enflo delivering a lecture at the 47th Summer Symposiun in Real Analysis held in Madrid in June 2025
3) Activities from 1 October to 8 October
5) Participation of IMI members in events organized by other institutions
Juan Seoane, miembro del IMI, impartirá una conferencia en la Universidad de Valencia el próximo martes.
6) La viñeta matemática
7) Math Puzzle
8) Integral Challenge
Stimulated by the succcessful competition “Premio de Integración Rápida”, the IMI has decided to initiate a specific section concerning the always challenging subject of integration. More than quickly-to-be-solved (indefinite) integrals, the purpose of this section is to propose interesting types of integrals that are deeply connected with many areas of mathematics, from the theory of special functions to geometric problems and numerical methods. Some of the integrals proposed are far from being solved by a standard method, but require a combination of different approaches and even the use of more sophisticated techniques. However, it is hoped that the readers have as much fun in solving the challenges as the Editors in proposing them.
Integral Challenge sent by Alberto Salguero (UCM).
Solution to last issue's Integral Challenge, sent by Juan Seoane and published on issue No. 229 of the Boletín del IMI:
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