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Merge pull request #4017 from pavi2410/patch-1

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[set-theory/en] Correction: Cardinality of an empty set is 0
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Adam Bard 2020-10-01 07:45:31 -07:00 committed by GitHub
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@ -44,7 +44,7 @@ For example, if `S = { 1, 2, 4 }`, then `|S| = 3`.
* The empty set can be constructed in set builder notation using impossible conditions, e.g. `∅ = { x : x =/= x }`, or `∅ = { x : x ∈ N, x < 0 }`;
* the empty set is always unique (i.e. there is one and only one empty set);
* the empty set is a subset of all sets;
* the cardinality of the empty set is 1, i.e. `|∅| = 1`.
* the cardinality of the empty set is 0, i.e. `|∅| = 0`.
## Representing sets