改错。
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\end{definition}
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\begin{definition}[零面积集]
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若$E \subset \realnum^2$满足:对任意的$\varepsilon > 0$,存在有限个闭矩形$\{D_i\}_{i = 1}^m$,使得$E \subset \bigcup \limits_{i = 1}^m D_i$且$\sum_{i = 1}^m \sigma(D_i) < \varepsilon$,则称$E$为二维零测集。
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若$E \subset \realnum^2$满足:对任意的$\varepsilon > 0$,存在有限个闭矩形$\{D_i\}_{i = 1}^m$,使得$E \subset \bigcup \limits_{i = 1}^m D_i$且$\sum_{i = 1}^m \sigma(D_i) < \varepsilon$,则称$E$为二维零面积集。
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\end{definition}
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\begin{corollary}
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