摘要
在弱完备的实Ｂａｎａｃｈ空间中，我们给出常微分方程Ｃａｕｃｈｙ问题的两个局部解存在定理和一个整体解存在定理，改进了［１］中的结果。
This article gives two local existence theorems and one global existence theorem in which solutions are found to the Cauchy problem of an ordinary differential equation in a Banach space, improving the resulta in [1].
