%0 Book Section %T Analytic families of operators in extrapolation theory with application to average operators publisher Springer %D 2026 %@ https://hdl.handle.net/20.500.14352/130469 %X Our goal is to prove weak type boundedness for an operator which is given as an average of a family of operators satisfying certain estimates in the context of weighted Lebesgue spaces. Our main technique is inspired on the theory of analytic families of operators and it is closely related to the Rubio de Francia’s extrapolation theory. %~