(Q191290)

English

ordered pair

pair of mathematical objects; tuple of specific length (tuple length n=2)

(a, b)
couple
double
pair
2-tuple

In more languages

Statements

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binary relation

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Elementi di teoria degli insiemi

9 November 2017

Ordered Pair Example.svg
500 × 500; 4 KB

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defining formula

(a,b)=\{\{a\},\{a,b\}\}

discoverer or inventor

Kazimierz Kuratowski

time of discovery or invention

1921

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Elementi di teoria degli insiemi

9 November 2017

(a_{1},b_{1})=(a_{2},b_{2})\quad \Leftrightarrow \quad a_{1}=a_{2}{\text{ and }}b_{1}=b_{2}

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(a,b):=\{\{\{a\},\,\emptyset \},\,\{\{b\}\}\}

discoverer or inventor

time of discovery or invention

1914

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(a,b):=\{\{a,1\},\{b,2\}\}

discoverer or inventor

Felix Hausdorff

time of discovery or invention

1914

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cardinality of this set

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Elementi di teoria degli insiemi

9 November 2017

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1 reference

Elementi di teoria degli insiemi

9 November 2017

Identifiers

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Encyclopædia Britannica Online ID

topic/ordered-pair

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Freebase Data Dumps

publication date

28 October 2013

ordered-pairs

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MathWorld identifier

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Microsoft Academic ID

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Sitelinks

Wikipedia(46 entries)

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