Which ordered pairs need to be added to the relationp = {(a,a),(a,d),(b,b),(b,d),(c,c),(d,a),(d,b)}on the set X = {a,b,c,d} to create the equivalence relation p* generated by p? A (a,a) B (a,b) C (a,c) D (a,d) E (b,a) F (b,b) G (b,c) H (b,d) I (c,a) J (c,b) K (c,c) L (c,d) M (d,a) N (d,b) O (d,c) P (d,d) Q None of them
Question
Which ordered pairs need to be added to the relationp = {(a,a),(a,d),(b,b),(b,d),(c,c),(d,a),(d,b)}on the set X = {a,b,c,d} to create the equivalence relation p* generated by p? A (a,a) B (a,b) C (a,c) D (a,d) E (b,a) F (b,b) G (b,c) H (b,d) I (c,a) J (c,b) K (c,c) L (c,d) M (d,a) N (d,b) O (d,c) P (d,d) Q None of them
Solution
Para que la relación sea una relación de equivalencia, debe ser reflexiva, simétrica y transitiva. Vamos a analizar cada una de estas propiedades y añadir los pares ordenados necesarios.
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Reflexividad: Cada elemento debe estar relacionado consigo mismo. Ya tenemos , , y , pero falta .
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Simetría: Si está en la relación, entonces también debe estar. Revisemos los pares:
- implica que necesitamos (ya está).
- implica que necesitamos (ya está).
- implica que necesitamos (ya está).
- implica que necesitamos (ya está).
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Transitividad: Si y están en la relación, entonces también debe estar. Revisemos los pares:
- y implican (ya está).
- y implican .
- y implican .
- y implican (ya está).
- y implican (ya está).
- y implican (ya está).
Ahora, revisemos los pares que faltan para cumplir con todas las propiedades:
Por lo tanto, los pares ordenados que deben añadirse son:
B (a,b), E (b,a), y P (d,d).
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