Three-term commutator estimates and the regularity of $\half$-harmonic maps into spheres

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Fractional superharmonic functions and the Perron method for nonlinear integro-differential equations (2016, background): “, the strong three-commutators estimates introduced in [6,7] to deduce the regularity of weak fractional harmonic maps (see also [40]), the strong barriers and density estimates in [37, 39], the pseudo-differential commutator and energy estimates in [35, 36], and many other successful techniques whi”