给出一个反例,说明存在一个非自反的,不是很光滑且其对偶空间没有(**)性质,但它是一个Asplund空间。这个例子表明Banach空间X很光滑(X*有(**)性质)是X为Asplund空间的充分条件。
An example of Asplund space was given,which isn't very smooth and whose dual hasn't property ( **). This example shows that X is very smooth (or X * has property ( ** ) ) in Banch space,which is the sufficient condition for that X is Asplund space.