We consider a non-local operator Lα which is the sum of a fractional Laplacian α/2 , α ∈ (0, 1), plus a ﬁrst order term which is measurable in the time variable and locally β-Hölder continuous in the space variables. Importantly, the fractional Laplacian Δα/2 does not dominate the ﬁrst order term. We show that global parabolic Schauder estimates hold even in this case under the natural condition α + β > 1. Thus, the constant appearing in the Schauder estimates is in fact independent of the L∞ -norm of the ﬁrst order term. In our approach we do not use the so-called extension property and we can replace α/2 with other operators of α-stable type which are somehow close, including the relativistic α-stable operator. Moreover, when α ∈ (1/2, 1), we can prove Schauder estimates for more general α-stable type operators.
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