a set of points such that for every pair of points there is a nonnegative real number called their distance that is symmetric and satisfies the triangle inequality どの2点をとっても、その距離が対称で、三角不等式を満たす、負でない実数が存在するような点の集合。
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【上位】 (mathematics) any set of points that satisfy a set of postulates of some kind; "assume that the topological space is finite dimensional" 何らかの必要条件の集合を満たす点の集合。
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【下位】 a space in which Euclid's axioms and definitions apply; a metric space that is linear and finite-dimensional ユークリッドの公理や定理が当てはまる空間。線形で有限次元の距離空間。
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