現代数学の系譜工学物理雑談古典ガロア理論も読む42

現代数学の系譜工学物理雑談古典ガロア理論も読む42at MATH

現代数学の系譜工学物理雑談古典ガロア理論も読む42 - 暇つぶし2ch525:言いたげだな。集合の包含関係すら知らないとは・・・ほれ、お前の好きなwikiだ。読んでみれｗ https://en.wikipedia.org/wiki/Subset The set of natural numbers is a proper subset of the set of rational numbers; likewise, the set of points in a line segment is a proper subset of the set of points in a line. These are two examples in which both the subset and the whole set are infinite, and the subset has the same cardinality (the concept that corresponds to size, that is, the number of elements, of a finite set) as the whole; such cases can run counter to one's initial intuition.

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