Ali–Fošner's generalized $(m,n)$-Jordan derivation conjecture

Let $m,n\geq 1$ be fixed integers, let $R$ be a semiprime ring satisfying suitable torsion restrictions, and let $F:R\longrightarrow R$ be a nonzero generalized $(m,n)$-Jordan derivation. Ali–Fošner's conjecture. Then $F$ is a derivation whose image is contained in $Z(R)$. The paper states that its first main theorem gives an affirmative answer under the explicit hypotheses that $m,n$ are distinct and $R$ is $6mn(m+n)|m-n|$-torsion free.