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

Michael Hrušák, L. Sáenz

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