In maths, what is aleph-zero?
the cardinality of the set of all countable ordinal numbers
the cardinality of the set of all natural numbers
the base value of the natural logarithm
the cardinality of the set of real numbers
The aleph numbers are a sequence of numbers used to represent the cardinality of infinite sets that can be well-ordered. The cardinality of the natural numbers is aleph-zero, the next larger cardinality is aleph-one, then aleph-two and so on. The concept and notation are due to Georg Cantor, who defined the notion of cardinality and realized that infinite sets can have different cardinalities.
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Answers by country
the cardinality of the set of all countable ordinal numbers
the cardinality of the set of all natural numbers
the base value of the natural logarithm
the cardinality of the set of real numbers
answers
Australia
27
Pakistan
12
Canada
10
Poland
4289
the United States
93
the Netherlands
18
Republic of Ireland
16
India
90
France
10
Malaysia
10
the United Kingdom
76
Germany
363
Austria
50
Switzerland
43
Greece
13