Nonlinear differentiation equation and analytic function spaces

In this paper we consider the nonlinear complex differential equation $(f^{(k)})^{n_{k}}+A_{k-1}(z)(f^{(k-1)})^{n_{k-1}}+\cdot\cdot\cdot+A_{1}(z)(f')^{n_{1}}+A_{0}(z)f^{n_{0}}=0,$where $A_{j}(z)$, $j=0, \cdots, k-1$, are analytic in the unit disk $\mathbb{D}$, $n_{j}\in R^{+}$ for all $j=0, \cdots, k$. We investigate this nonlinear differential equation from two aspects. On one hand, we provide some sufficient conditions on coefficients such that all solutions of this equation belong to a class of Möbius invariant function space, the so-called $Q_K$ space. On the other hand, we find some growth estimates for the analytic solutions of this equation if the coefficients belong to some analytic function spaces.

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