Abstract
In this paper we present an interpolation approach to the fractional Sobolev spaces in Carnot groups using the K-method. This approach provides us with a different characterization of these Sobolev spaces, moreover, it provides us with the limiting behavior of the fractional Sobolev norms at the end-points. This allows us to deduce results similar to the Bourgain–Brezis–Mironescu and Maz’ya–Shaposhnikova in the case p>1 and Dávila’s result in the case p=1. Also, this allows us to deduce the limiting behavior of the fractional perimeter in Carnot groups.
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