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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

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Solution

Para que la relación p p 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.

  1. Reflexividad: Cada elemento debe estar relacionado consigo mismo. Ya tenemos (a,a)(a,a), (b,b)(b,b), y (c,c)(c,c), pero falta (d,d)(d,d).

  2. Simetría: Si (x,y)(x,y) está en la relación, entonces (y,x)(y,x) también debe estar. Revisemos los pares:

    • (a,d)(a,d) implica que necesitamos (d,a)(d,a) (ya está).
    • (b,d)(b,d) implica que necesitamos (d,b)(d,b) (ya está).
    • (d,a)(d,a) implica que necesitamos (a,d)(a,d) (ya está).
    • (d,b)(d,b) implica que necesitamos (b,d)(b,d) (ya está).
  3. Transitividad: Si (x,y)(x,y) y (y,z)(y,z) están en la relación, entonces (x,z)(x,z) también debe estar. Revisemos los pares:

    • (a,d)(a,d) y (d,a)(d,a) implican (a,a)(a,a) (ya está).
    • (a,d)(a,d) y (d,b)(d,b) implican (a,b)(a,b).
    • (b,d)(b,d) y (d,a)(d,a) implican (b,a)(b,a).
    • (b,d)(b,d) y (d,b)(d,b) implican (b,b)(b,b) (ya está).
    • (d,a)(d,a) y (a,d)(a,d) implican (d,d)(d,d) (ya está).
    • (d,b)(d,b) y (b,d)(b,d) implican (d,d)(d,d) (ya está).

Ahora, revisemos los pares que faltan para cumplir con todas las propiedades:

  • (a,b)(a,b)
  • (b,a)(b,a)
  • (d,d)(d,d)

Por lo tanto, los pares ordenados que deben añadirse son:

B (a,b), E (b,a), y P (d,d).

This problem has been solved

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