Type: Article

Some applications of Q-points and Lebesgue filters to Banach spaces

Hrušák, M.; Sáenz, L.;

Abstract:

We present a new characterization of Q-point ultrafilters and use it to optimize the result of Avilés, Martínez-Cervantes, and Rueda Zoca linking the existence of L-orthogonal sequences and L-orthogonal elements in Banach spaces via ultrafilter limits.''