cardinality

IPA/ˈkɑː.dɪnˈæl.ə.ti/
IPA/ˈkɑːr.dɪnˈæl.ə.t̬i/

cardinality — noun

  • cardinalitysingular
  • cardinalitiesplural

1. in mathematics, the total number of members that a set contains

1.名詞C2
釋義

in mathematics, the total number of members that a set contains

例句

On the board, Joon wrote that set A has cardinality 4.

pattern: set A has cardinality 4

The two groups have the same cardinality because each contains six points.

collocation: the same cardinality

同義詞
  • set size

    an informal mathematical way to talk about how many members a set has

  • size

    common shorthand in set theory, but outside maths it often means physical dimensions instead

文法句型

the cardinality of [set]

same cardinality as [set]

[set] has cardinality [number]

用法筆記

Usually appears in mathematics with an of-phrase naming the set or in comparisons such as the same cardinality as. Distinguish it from everyday size: cardinality counts how many members are in a set, not how large something is physically.

常見錯誤

❌The box has a cardinality of ten centimeters.
✅The box has a size of ten centimeters.
💡cardinality is about how many members a set has, not physical dimensions.