[Todos CMAT] Fwd: ICTP Mathematics Seminar - TOMORROW - Tuesday 19 September, at 14:00 - Gustavo Araújo

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TOMORROW - Tuesday 19 September, at 14:00
*Venue*: Luigi Stasi seminar room (Leonardo da Vinci Building)

*Speaker:*
Gustavo Araújo (UEPB, Brazil)

*Title:*
Quantitative and qualitative estimates on the norm of product of polynomials

*Abstract:*
When for the first time, in 1987, a Banach space /X/ and a bounded  
operator /T/ : /X/→/X/ with no trivial invariant subspaces was  
constructed, two of the many tools used by P.H. Enflo was the  
“concentration of polynomials at low degrees” and a series of  
estimates on the norm of products of polynomials. The concept of  
concentration of polynomials at low degrees has been adapted to other  
norms and one of these adaptations falls within the case of sets with  
gaps or missing portions (the so-called lacunary sets). Here we deepen  
into the study of these two concepts and, among other things, we  
present a result on estimates of lacunary norms of product of  
polynomials.


/This is a joint work with P.H. Enflo, G.A. Muñoz-Fernández, D.L.  
Rodríguez-Vidanes and J.B. Seoane-Sepúlveda./

https://indico.ictp.it/event/10542/<https://indico.ictp.it/event/10541/>

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