As alpha approaches 1 from below, (1-alpha) times the Riesz potential of D^alpha f converges to K_n times the Riesz potential of |grad f| for smooth compactly supported f, with subsequence a.e. convergence extended to W^{1,1} functions.
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Bourgain-Brezis-Mironescu formula for Riesz Potentials
As alpha approaches 1 from below, (1-alpha) times the Riesz potential of D^alpha f converges to K_n times the Riesz potential of |grad f| for smooth compactly supported f, with subsequence a.e. convergence extended to W^{1,1} functions.