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New radar technology is making it easier - and cheaper - for hydrologists and Civil Defence to keep an eye on rivers around the West Coast and predict floods. After weeks of uncertainties, …

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它是用 n 乘以每个整数的积的集合 \{\cdots-3n, -2n, -n, 0, n, 2n, 3n, \cdots\} ，或者写成 n\mathbb{Z} = \{nz | z \in \mathbb{Z}\} 。 例如 2\mathbb{Z} 包括 \{\cdots -4, -2, 0, 2, 4, 6, …

2020年1月26日 · It consists of all the elements in Z / nZ that have an inverse. These elements form a group with multiplication. Example: Z / 4Z = {0, 1, 2, 3} form a group with respect to …