LIPSCHITZ FREE SPACES ISOMORPHIC TO THEIR INFINITE SUMS AND GEOMETRIC APPLICATIONS

We find general conditions under which Lipschitz-free spaces over metric spaces are isomorphic to their infinite direct l(1)-sum and exhibit several applications. As examples of such applications we have that Lipschitz-free spaces over balls and spheres of the same finite dimensions are isomorphic, that the Lipschitz-free space over Z(d) is isomorphic to its l(1)-sum, or that the Lipschitz-free space over any snowflake of a doubling metric space is isomorphic to l(1). Moreover, following new ideas of Bru`e et al. from [J. Funct. Anal. 280 (2021), pp. 108868, 21] we provide an elementary self-contained proof that Lipschitz-free spaces over doubling metric spaces are complemented in Lipschitz-free spaces over their superspaces and they have BAP. Everything, including the results about doubling metric spaces, is explored in the more comprehensive setting of p-Banach spaces, which allows us to appreciate the similarities and differences of the theory between the cases p < 1 and p = 1.