Character of a Filter (指標) (Definition II.2.17)

• Character of a Filter (指標) (Definition II.2.17) #Card
  • The least cardinality of the filter-bases of $\mathcal{F}$, denoted $\chi(\mathcal{F})$.

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The least cardinality of the filter-bases of $\mathcal{F}$, denoted $\chi(\mathcal{F})$.

Lean

フィルターの指標（基底の最小濃度）。本書独自の濃度量