Boletín Nº 179
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Boletín del IMI
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Dear IMI members,
I am pleased to announce that the IMI is hosting a visiting professor from Universidad Rey Juan Carlos. His name is Víctor Aceña Gil, and he will be with us until September 8, 2025. Professor Aceña will carry out his research at the IMI on optimization techniques for the study of resampling-based classification methods, under the supervision of Francisco Javier Martín Campo.
Victor Aceña Gil
June 16 2025. Professor Per Enflo outlined the strategy and key steps involved in his proof aiming for a positive resolution of the invariant subspace problem in Hilbert spaces. His lecture was delivered during the 47th Symposium on Real Analysis, hosted by the Faculty of Mathematics at the Complutense University of Madrid from June 16 to 20, 2025. This edition of the Symposium, held for the first time in Spain, has been co-organized by the Interdisciplinary Mathematics Institute (IMI). It is also worth noting that Professor Enflo was named an Honorary Professor at the IMI during the 2023–2024 academic year.
3) Activities from 19 to 27 June
5) Other planned activities
6) La viñeta matemática
7) Math Puzzle
Eye of the apple
The blue fraction is 3-2√2.
The key to the solution is Euler’s theorem, stating that d2=R2-2Rr, where r is the radius of the triangle incircle, R the radius of its circumcircle and d the distance between the incentre and the circumcentre.
In this case d=r, leading to r/R=√2-1. The required fraction is the square of this number.
8) Math Art
Math Art sent by Rafael Araujo
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