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Which ordered pairs need to be added to the relationp = {(a,a),(a,b),(a,c),(a,d),(b,a),(c,a),(c,c),(d,a)}on the set X = {a,b,c,d} to create the equivalence relation p* generated by p?

Question

Which ordered pairs need to be added to the relationp = {(a,a),(a,b),(a,c),(a,d),(b,a),(c,a),(c,c),(d,a)}on the set X = {a,b,c,d} to create the equivalence relation p* generated by p?

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Solution

Para crear la relación de equivalencia p p^* generada por p p , necesitamos asegurarnos de que la relación sea reflexiva, simétrica y transitiva. Vamos a verificar 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) y (c,c)(c, c).
    • Faltan: (b,b)(b, b) y (d,d)(d, d).
  2. Simetría: Si (x,y)(x, y) está en la relación, entonces (y,x)(y, x) también debe estar.

    • Ya tenemos: (a,a)(a, a), (b,a)(b, a), (c,a)(c, a), (d,a)(d, a).
    • Faltan: (a,b)(a, b), (a,c)(a, c), (a,d)(a, d).
  3. Transitividad: Si (x,y)(x, y) y (y,z)(y, z) están en la relación, entonces (x,z)(x, z) también debe estar.

    • Verificamos las combinaciones posibles:
      • De (a,b)(a, b) y (b,a)(b, a), necesitamos (a,a)(a, a) (ya está).
      • De (a,c)(a, c) y (c,a)(c, a), necesitamos (a,a)(a, a) (ya está).
      • De (a,d)(a, d) y (d,a)(d, a), necesitamos (a,a)(a, a) (ya está).
      • De (b,a)(b, a) y (a,b)(a, b), necesitamos (b,b)(b, b) (ya está).
      • De (c,a)(c, a) y (a,c)(a, c), necesitamos (c,c)(c, c) (ya está).
      • De (d,a)(d, a) y (a,d)(a, d), necesitamos (d,d)(d, d) (ya está).
      • De (a,b)(a, b) y (b,c)(b, c), necesitamos (a,c)(a, c) (ya está).
      • De (a,b)(a, b) y (b,d)(b, d), necesitamos (a,d)(a, d) (ya está).
      • De (b,a)(b, a) y (a,c)(a, c), necesitamos (b,c)(b, c).
      • De (b,a)(b, a) y (a,d)(a, d), necesitamos (b,d)(b, d).
      • De (c,a)(c, a) y (a,b)(a, b), necesitamos (c,b)(c, b).
      • De (c,a)(c, a) y (a,d)(a, d), necesitamos (c,d)(c, d).
      • De (d,a)(d, a) y (a,b)(a, b), necesitamos (d,b)(d, b).
      • De (d,a)(d, a) y (a,c)(a, c), necesitamos (d,c)(d, c).

Entonces, los pares ordenados que necesitamos añadir son: {(b,b),(d,d),(a,b),(a,c),(a,d),(b,c),(b,d),(c,b),(c,d),(d,b),(d,c)} \{(b, b), (d, d), (a, b), (a, c), (a, d), (b, c), (b, d), (c, b), (c, d), (d, b), (d, c)\}

Por lo tanto, la relación de equivalencia p p^* generada por p p es: {(a,a),(a,b),(a,c),(a,d),(b,a),(b,b),(b,c),(b,d),(c,a),(c,b),(c,c),(c,d),(d,a),(d,b),(d,c),(d,d)} \{(a, a), (a, b), (a, c), (a, d), (b, a), (b, b), (b, c), (b, d), (c, a), (c, b), (c, c), (c, d), (d, a), (d, b), (d, c), (d, d)\}

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