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Empty set - kuushūgō (English spelling) empty set, void set
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A set that does not contain any elements is called the empty set and is represented by the symbol ∅. If a point on a plane is represented by coordinates ( x , y ), and the set M is M = {( x , y ) | x2 + y2 < r }, then if r < 0, M has no elements. In other words, M = ∅. The empty set is a subset of all sets. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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元（要素）を一つも含まない集合を空集合といい，記号∅で表す。平面上の点を座標（x，y）で表し，集合 M を M＝｛（x，y）｜x2＋y2＜r｝とするとき，もし r＜0 であれば，Mは元をもたない。すなわち M＝∅ である。空集合はすべての集合の部分集合である。
出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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