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Fix: Cardinality of an empty set is 0

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Citations:
- JMoravitz (https://math.stackexchange.com/users/179297/jmoravitz), What is the cardinality of the set of the empty set?, URL (version: 2016-01-13): https://math.stackexchange.com/q/1610231
- Wikipedia contributors. (2020, September 25). Empty set. In Wikipedia, The Free Encyclopedia. Retrieved 06:50, September 29, 2020, from https://en.wikipedia.org/w/index.php?title=Empty_set&oldid=980302053
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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