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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
flagAustralia
10%
41%
34%
13%
29
flagPakistan
8%
41%
33%
16%
12
flagthe United States
20%
40%
24%
15%
105
flagCanada
20%
40%
30%
0%
10
flagPoland
25%
38%
17%
17%
4367
flagthe Netherlands
36%
31%
26%
5%
19
flagRepublic of Ireland
18%
31%
18%
31%
16
flagIndia
24%
30%
30%
10%
91
flagthe United Kingdom
19%
30%
26%
24%
83
flagMalaysia
30%
30%
30%
10%
10
flagGermany
22%
27%
31%
17%
384
flagFrance
33%
25%
33%
8%
12
flagAustria
13%
23%
43%
19%
51
flagSwitzerland
30%
19%
26%
21%
46
flagGreece
30%
15%
30%
23%
13

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