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Relation   (inglés)

Definición Nivel 1

A way of connecting two sets of things.
E.g. ....is the sister of ......
....is smaller than......
....lives in .....
....is a factor of......
....is 8 more than....
A mapping diagram is often used to show relations

Definición Nivel 2

A operation which associates pairs of objects, saying that they are 'related' to one another by that relation. For instance, = and > are relations.

Definición Nivel 4

A relation between two sets A and B is any subset of the Cartesian product A ×B . a is said to be related to b iff (a,b) is in this set.
The composition of two relations R and S is the set
R °S = {(x,z) | ( ∃y)(x,y) ∈ R     and (y,z) ∈ S } .

Compare equivalence relation, function.

Financiado por: Socrates Minerva UE, HeyMath!, Cambridge University Press
Copyright: 2001-2004 Universidad de Cambridge y socios.