摘要从六个方面说明了确定一阶微分方程解的存在区间的方法.The methods that how to determine the existential interval of solution of the first order differential equations are studied from six aspects.
关键词存在唯一性定理解的延拓定理比较定理比哈利(Bihali)引理存在区间方向场最大存在区间existence and uniqueness theorem, extension theorem comparison theorem Bihali lemma existential interval direction field biggest existence interval
