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Symbol: A×B
Symbol Name: cartesian product
Meaning / definition: set of all ordered pairs from A and B
Example:
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Symbol: │A│
Symbol Name: cardinality
Meaning / definition: the number of elements of set A
Example: A={3,9,14}, │A│=3
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Symbol: #A
Symbol Name: cardinality
Meaning / definition: the number of elements of set A
Example: A={3,9,14}, #A=3
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Symbol: │
Symbol Name: vertical bar
Meaning / definition: such that
Example: A={x│3<x<14}
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Symbol: 
Symbol Name: aleph-null
Meaning / definition: infinite cardinality of natural numbers set
Example:
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Symbol: 
Symbol Name: aleph-one
Meaning / definition: cardinality of countable ordinal numbers set
Example:
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Symbol: 
Symbol Name: universal set
Meaning / definition: set of all possible values
Example:
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Symbol: 
0
0Symbol Name: natural numbers / whole numbers set (with zero)
Meaning / definition: 0 = {0,1,2,3,4,...}
0 = {0,1,2,3,4,...}Example: 0 ∈ 0
0Permalink: URL
Symbol: 1
1Symbol Name: natural numbers / whole numbers set (without zero)
Meaning / definition: 1 = {1,2,3,4,5,...}
1 = {1,2,3,4,5,...}Example: 6 ∈ 1
1Permalink: URL
Symbol: 
Symbol Name: integer numbers set
Meaning / definition: = {...-3,-2,-1,0,1,2,3,...}
= {...-3,-2,-1,0,1,2,3,...}Example: -6 ∈
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Symbol: 
Symbol Name: rational numbers set
Meaning / definition: = {x │ x=a/b, a,b∈}
= {x │ x=a/b, a,b∈}Example: 2/6 ∈
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Symbol: 
Symbol Name: real numbers set
Meaning / definition: = {x │ -∞ < x <∞}
= {x │ -∞ < x <∞}Example: 6.343434∈
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Symbol: 
Symbol Name: complex numbers set
Meaning / definition: = {z │ z=a+bi, -∞<a<∞, -∞<b<∞}
= {z │ z=a+bi, -∞<a<∞, -∞<b<∞}Example: 6+2i ∈
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