Explicit descriptions are obtained for a class of low-degree rational functions permuting μ_{q+1} over finite fields in any characteristic, producing many permutation quadrinomials over F_{q^2}.
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Explicit determination of a class of permutation rational functions in any characteristic
Explicit descriptions are obtained for a class of low-degree rational functions permuting μ_{q+1} over finite fields in any characteristic, producing many permutation quadrinomials over F_{q^2}.