File:Nullset.svg · Wikimedia Commons · See Wikimedia Commons
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An empty set is a collection that contains nothing at all — no items, no members, no elements inside it. It matters in mathematics because it serves as a foundation for building logical systems and helps mathematicians precisely define and reason about collections of things.
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Article · 日本語
空集合（くうしゅうごう、英: empty set）は、要素を一切持たない集合のことである。公理的集合論において、空集合は公理として存在を仮定される場合と、他の公理から存在が導かれる場合がある。
Abstract from DBpedia / Wikipedia · CC BY-SA
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