Word Count : 212

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Consider the first set: [ A = { 3n : n \in \mathbb{N} }. ] This is a set of discrete points ({3, 6, 9, 12, \dots}) in (\mathbb{R}). In the real numbers, an open set requires that for each point there ________ ___ __________ ____ ______ _____ ______ __________ ________.
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