数学物理学报(英文版) ›› 1983, Vol. 3 ›› Issue (4): 445-453.
王振宇
Wang Zhenyu
摘要: The autaor in his previous papers obtained a series of results about some enumeration (or, combinatorial) problems over trees, such as binary trees, t-ary trees, ordered trees.and oriented trees. The purpose of this paper is to develop a unified scheme dealing with these problems. He introduced the concept, so-called additive enumeration problems,to cover a wide class of enumeration problems over trees.