摘要
推广了杨重骏、杨乐等证明的：若ｆ为一超越整函数，ｎ，ｋ为非负整数且ｎ≥２，则ｆ（ｆ（ｋ）ｎ唯一可能的Ｐｉｃａｒｄ例外值是０这一结果；证明了当ｆ（ｋ）易为ｆ的相当广泛的微分多项式时，相应结论仍成立。
Generalize a result obtained by Yang C.C. and Yang Le: Let f be a transcendental entire function, n,k be two non-negative integers with n≥2, then the only possible Picard Exceptional Value of f(f(k))n is zero, proved the above conclusion still holds when f(k) is replaced by differential polynomial of f of a rather wide kind.
