Lü–Li–Yang conjecture on shared polynomials and derivatives of powers of entire functions

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Let ff be a transcendental entire function and let nn be a positive integer. Let kk be a positive integer, and let Q1Q_{1} and Q2Q_{2} be polynomials with Q1Q2≢0Q_{1}Q_{2}\not\equiv 0. Assume that fn−Q1f^{n}-Q_{1} and (fn)(k)−Q2(f^{n})^{(k)}-Q_{2} share 00 CM, and that n≥k+1n\geq k+1. Lü–Li–Yang conjecture. Then

(fn)(k)=Q2Q1fn.(f^{n})^{(k)}=\frac{Q_{2}}{Q_{1}}f^{n}.

If, further, Q1≡Q2Q_{1}\equiv Q_{2}, then

f=ceωzn,f=ce^{\frac{\omega z}{n}},

where cc and ω\omega are nonzero constants such that ωk=1\omega^{k}=1. This conjecture seeks a two-polynomial extension of uniqueness results for entire functions and their derivatives; the supplied text does not establish its resolution.

References

Primary source

Indrajit Lahiri and Sujoy Majumder, “On a conjecture of Lü, Li and Yang”, arXiv:1811.07075 (2018).

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