Let R and S be relations on {1,2,3,4} given byR = {(1, 1), (1, 2), (3, 4), (4, 2)}S = {(1, 1), (2, 1), (3, 1), (4, 4), (2, 2)}List the elements of R ◦ S
Question
Let R and S be relations on {1,2,3,4} given byR = {(1, 1), (1, 2), (3, 4), (4, 2)}S = {(1, 1), (2, 1), (3, 1), (4, 4), (2, 2)}List the elements of R ◦ S
Solution
Para encontrar los elementos de (la composición de las relaciones y ), debemos buscar todos los pares tales que existe un donde y .
Dado:
Vamos a buscar los pares :
-
Para :
- y → está en .
- y → está en .
-
Para :
- y → está en .
- y → está en .
- y → No hay tal par en .
-
Para :
- y → está en .
- y → está en .
-
Para :
- y → está en .
Por lo tanto, los elementos de son:
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