Resumen de Extrapolation theory for the real interpolation method
Joaquín Martín, María Jesús Carro Rossell 
We develop an abstract extrapolation theory for the real interpolation method that covers and improves the most recent versions of the celebrated theorems of Yano and Zygmund. As a consequence of our method, we give new endpoint estimates of the embedding Sobolev theorem for an arbitrary domain Omega.
