From 7d927011da46e767371334a54ab9e6bca6730f7f Mon Sep 17 00:00:00 2001 From: Pavitra Golchha Date: Tue, 29 Sep 2020 12:21:58 +0530 Subject: [PATCH] Fix: Cardinality of an empty set is 0 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 --- set-theory.html.markdown | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/set-theory.html.markdown b/set-theory.html.markdown index 6fb657ed..1894c306 100644 --- a/set-theory.html.markdown +++ b/set-theory.html.markdown @@ -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