紧集上的连续映射 为了将一元连续函数在闭区间上的重要性质推广到多元连续函 数,为此先定义多元函数在点集的边界点连续的概念。 定义 11.3.1 设点集 K ⊂ n R ,f : K→ m R 为映射(向量值函数), x K 0 ∈ 。如果对于任意给定的ε > 0,存在δ > 0,使得当 0 xx K ∈O( ,) δ ∩ 时
\Putting American Back to Work\ Thank you. Thank you. Senator Hatfield, Mr. Chief Justice, Mr. President, Vice President Bush, Vice President Mondale, Senator Baker, Speaker O’Neill, Reverend Moomaw, and my fellow citizens: To a few of us here today this is a solemn and most momentous occasion. And, yet