existence cost生存成本existencen.存在；生存existence and convergence theorem存在性收敛性定理existence and uniqueness property存在唯一性existence and uniqueness of solution惟一可解性existence and disappearance of plays剧目存佚existence aesthetics literary theory生存美学的文论existence characteristics of ore body矿床贮存条件existence theorem of implicit function隐函数的存在性定理existence of non-institutionalization非制度化生存existence and uniformly valid estimation存在性和一致有效估计existence study of internal relationship内在关系存在论