# Events for July 26, 2017 from General and Seminar calendars

## Workshop in Analysis and Probability Seminar

**Time:** 2:00PM - 2:50PM

**Location:** BLOC 220

**Speaker:** Cleon Da Silva Barroso, Universidade Federal do CearĂˇ

**Title:** *Existence of shift basic sequences and its implications*

**Abstract:**It is shown that every seminormalized sequence with no weakly convergent subsequences admits a wide-(s) subsequence which is shift equivalent. Also, basic sequences with shiftable properties are studied. They give rise to a generalized form of the Pelczynski's property (u), called property (su). It is shown that every Banach space with a conditional spreading basis has property (su). As a consequence the classical Jamesâ€™ space J2 has property (su), which nicely contrast with the fact that it does not have Pelczynski's property (u).

## Workshop in Analysis and Probability Seminar

**Time:** 3:00PM - 3:50PM

**Location:** BLOC 220

**Speaker:** Jesus Suarez, University of Extremadura

**Title:** *Weak Hilbert structures on twisted sums of \ell_2*

**Abstract:**We study when a twisted sum of \ell_2 with itself may be close to be a Weak Hilbert space, namely if it may have the property (H) or to be asymptotically \ell_2 for example. We show that \ell_2 is the only symmetric twisted sum of \ell_2 that may be a Weak Hilbert space. On the other hand, we may prove that there is a nontrivial twisted sum of \ell_2 having the E(n,n,K)-property introduced by Nielsen and Tomczak-Jaegermann. Several open problems will be explained.