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The cardinality of a finite set is the number of elements in the set. The cardinality of infinite sets is infinity but - if you really want to go into it - reflects a measure of the degree of...
00 is not a set but the number zero written as a 2-digit number. The set {00} has cardinality 1.
Assuming no restrictions on the set, the cardinality of a set, n, is related in this form # of subsets = 2n
In mathematics, the cardinality of a set is a measure of the "number of elements of the set". For example, the set A = {2, 4, 6} contains 3 elements, and therefore A has a cardinality of 3. There are two approaches to cardinality - one which compares sets directly using bijections and injections, and another which uses cardinal numbers.
No. If the cardinality of a finite set is N, then that of its power set is 2N. These cannot be equal for any non-negative integer N.