So you are right, the cardinality is $2$. In your case, you have two elements in your set: the element $1$, and the element $\{2,3\}$ (which happens to be a set itself). For example, the cardinality of the set of people in the United States is approximately 270,000,000; the cardinali Good trap, Dr Ruff. For example, the set = {,,} contains 3 elements, and therefore has a cardinality of 3. Ex3. The cardinality of a set is the number of elements contained in the set and is denoted n(A). If you do these should be easy. For finite sets, the cardinality is simply the numberofelements intheset. Cardinality can be finite (a non-negative integer) or infinite. The number is also referred as the cardinal number. Math Team. I presume you have sent this A2A to me following the most recent instalment of our ongoing debate regarding the ontological nature and resultant enumeration of Zero. Cardinality of a set S, denoted by |S|, is the number of elements of the set. agentredlum. The cardinality of a set is denoted by $|A|$. There are two approaches to cardinality – one which compares sets directly using bijections and injections, and another which uses cardinal numbers. We first discuss cardinality for finite sets and then talk about infinite sets. We can say that set A and set B both have a cardinality of 3. For finite sets, cardinality is just the number of elements in the set. For example, ifA={a,b,c}, then|A| =3. If a set has an infinite number of elements, its cardinality is ∞. Do you know the definition of "cardinality of set"? Jul 2011 3,372 234 North America, 42nd parallel Nov 4, 2012 #3 Think of a set as an empty sack where you can insert anything you want, including OTHER empty sacks. The term cardinality refers to the number of elements, or members, in a set. Both set A={1,2,3} and set B={England, Brazil, Japan} have a cardinal number of 3; that is, n(A)=3, and n(B)=3. In mathematics, the cardinality of a set is a measure of the "number of elements of the set". To extend the notion of cardinality to infinite sets we start by defining the notion of comparing sets. Cardinality of Sets The cardinality of a set A, denoted |A|, is a measure of the size of the set. Here we need to talk about cardinality of a set, which is basically the size of the set.

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