中文摘要：

摘要：运用角域内值分布的理论和方法，研究了整系数2阶线性微分方程，f＂＋Af＇＋Bf=0的解在角域内的增长性和Borel方向．在给定条件下，证明了方程的每一非零解在含有B的（λ〉0）级Borel方向的任意角域内的增长级均为无穷，且B的λ级Borel方向与解的无穷级Borel方向一致．

英文摘要：

The growth and Borel direction of solutions in angular domains for differential equation f＂＋Af＇＋Bf=0 is investigated where A （z） and B （z） are entire functions, by using the fundamental theory and method of value distribution in angular domain. Under some conditions, it is proved that every solutionf≠O of the equation is of infinite order in any angular domain which has λ order Borel direction of B（z） ,and the w order Borel direction of the solution is unanimous with the λ order Borel direction of B（z）.