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UPC – Departamento de Ciencias – MATEMATICA DISCRETA (MA265)
Profesores MA265 1
Manipulación de relaciones
Respuestas de los ejercicios propuestos
1. Respuestas
a) 𝑀 𝑅 =
[
0 0 1 0 0
1 0 0 0 0
0 0 0 1 0
0 1 0 0 0
0 0 0 0 1]
𝑀 𝑆 =
[
0 1 0 1 1
1 1 1 1 0
0 1 1 1 0
0 0 0 0 0
1 0 0 0 0]
b) 𝑀 𝑆 −1 =
[
0 1 0 0 1
1 1 1 0 0
0 1 1 0 0
1 1 1 0 0
1 0 0 0 0]
𝑀 𝑅̅ =
[
1 1 0 1 1
0 1 1 1 1
1 1 1 0 1
1 0 1 1 1
1 1 1 1 0]
c) 𝑀 𝑅∪𝑆 −1 =
[
0 1 1 0 1
1 1 1 0 0
0 1 1 1 0
1 1 1 0 0
1 0 0 0 1]
𝑀 𝑅̅∩𝑆 =
[
0 1 0 1 1
0 1 1 1 0
0 1 1 0 0
0 0 0 0 0
1 0 0 0 0]
d) 𝑀 𝑆∘𝑅 = 𝑀 𝑅 ⊙ 𝑀 𝑆 =
[
0 1 1 1 0
0 1 0 1 1
0 0 0 0 0
1 1 1 1 0
1 0 0 0 0]
2. Respuestas
a)
𝑀 𝑅 =
[
1 0 0 0 1 0
0 0 1 0 0 1
0 1 0 1 0 0
0 0 1 0 0 1
1 0 0 0 1 0
0 1 0 1 0 0]
𝑀 𝑆 =
[
1 0 0 0 0 0
0 0 1 0 0 0
0 1 1 0 0 0
1 0 0 1 1 0
0 1 0 0 0 1
0 0 0 0 1 0]
b)
𝑀 𝑅 −1 =
[
1 0 0 0 1 0
0 0 1 0 0 1
0 1 0 1 0 0
0 0 1 0 0 1
1 0 0 0 1 0
0 1 0 1 0 0]
𝑀 𝑆̅ =
[
0 1 1 1 1 1
1 1 0 1 1 1
1 0 0 1 1 1
0 1 1 0 0 1
1 0 1 1 1 0
1 1 1 1 0 1]
c)
𝑀 𝑆̅∪𝑅 −1 =
[
1 1 1 1 1 1
1 1 1 1 1 1
1 1 0 1 1 1
0 1 1 0 0 1
1 0 1 1 1 0
1 1 1 1 0 1]
𝑀 𝑆̅∩𝑅 =
[
0 0 0 0 1 0
0 0 0 0 0 1
0 0 0 1 0 0
0 0 1 0 0 1
1 0 0 0 1 0
0 1 0 1 0 0]
UPC – Departamento de Ciencias – MATEMATICA DISCRETA (MA265)
Profesores MA265 2
d)
𝑀 𝑆∘𝑅 −1 =
[
1 1 0 0 0 1
0 1 1 0 1 0
1 0 1 1 1 0
0 1 1 0 1 0
1 1 0 0 0 1
1 0 1 1 1 0]
3. Respuestas
Cerradura reflexiva:
𝑅 ∪△= {(1; 1), (1; 2), (1; 3), (1; 6), (2; 2), (2; 6), (3; 3), (3; 6), (6; 6)}
Cerradura simétrica:
𝑅 ∪ 𝑅 −1 = {(1; 2), (1; 3), (1; 6), (2; 1), (2; 6), (3; 1), (3; 6), (6; 1), (6; 2), (6; 3), (6; 6)}
Cerradura transitiva:
𝑅 ∞ = {(1; 2), (1; 3), (1; 6), (2; 6), (3; 6)}
4. Respuestas
a) 𝑅̅ = {(0; 0), (0; 1), (0; 2), (1; 0), (1; 1), (1; 3), (2; 0), (2; 2), (2; 3),
(3; 1), (3; 2), (3; 3)}
𝑆̅ = {(1; 0), (2; 0), (2; 1), (3; 0), (3; 1), (3; 2)}
b) 𝑅 −1 = {(0; 3), (1; 2), (2; 1), (3; 0)}
𝑆 −1 = {(0; 0), (1; 0), (1; 1), (2; 0), (2; 1), (2; 2), (3; 0), (3; 1), (3; 2), (3; 3)}
c) 𝑅 ∪ 𝑆 = {(0; 0), (0; 1), (0; 2), (0; 3), (1; 1), (1; 2), (1; 3), (2; 1), (2; 2),
(2; 3), (3; 3), (3; 3)}
𝑅 ∩ 𝑆 = {(0; 3), (1; 2)}
d) 𝑅 ∘ 𝑆 = {(0; 0), (0; 1), (0; 2), (0; 3), (1; 0), (1; 1), (1; 2), (2; 0), (2; 1), (3; 0)}
5. Respuestas
a) 𝑅̅ = {(1; 4), (1; 5), (2; 5), (4; 1), (5; 1), (5; 2)}
𝑆̅ = {(1; 1), (1; 3), (1; 5), (2; 2), (2; 4), (3; 1), (3; 3), (3; 5), (4; 2), (4; 4), (5; 1),
(5; 3), (5; 5)}
b) 𝑅 −1 = {(1; 1), (1; 2), (1; 3), (2; 1), (2; 2), (2; 3), (2; 4), (3; 1), (3; 2), (3; 3), (3; 4),
(3; 5), (4; 2), (4; 3), (4; 4), (4; 5), (5; 3), (5; 4), (5; 5) }
𝑆 −1 = {(1; 2), (1; 4), (2; 1), (2; 3), (2; 5), (3; 2), (3; 4), (4; 1), (4; 3), (4; 5),
(5; 2), (5; 4)}
c) 𝑅 ∪ 𝑆 = {(1; 1), (1; 2), (1; 3), (1; 4), (2; 1), (2; 2), (2; 3), (2; 4), (2; 5), (3; 1), (3; 2),
(3; 3), (3; 5), (3; 6), (4; 1), (4; 2), (4; 3), (4; 4), (4; 5), (5; 2), (5; 3), (5; 4), (5; 5) }
𝑅 ∩ 𝑆 = {(1; 2), (2; 1), (2; 3), (3; 2), (3; 4), (4; 3), (4; 5), (5; 4)}
d) 𝑅̅ ∘ 𝑆 −1 = {(1; 1), (1; 5), (2; 1), (2; 2), (2; 4), (2; 5), (3; 1), (3; 5), (4; 1), (4; 2), (4; 4),
(4; 5), (5; 1), (5; 5)}
UPC – Departamento de Ciencias – MATEMATICA DISCRETA (MA265)
Profesores MA265 3
6. Respuestas
a) 𝑅̅ = {(−1; −1), (−1; 0), (−1; 1), (−1; 2), (0; −1), (0; 0), (0; 1), (0; 3), (1; −1),
(1; 0), (1; 2), (1; 3), (2; −1), (2; 1), (2; 2), (2; 3), (3; 0), (3; 1), (3; 2), (3; 3)}
𝑆̅ = {(−1; 2), (0; 0), (0; 2), (1; −1), (1; 0), (1; 1), (1; 2), (1; 3), (2; −1), (3; −1)}
b) 𝑅 −1 = {(−1; 3), (0; 2), (1; 1), (2; 0), (3; −1)}
𝑆 −1 = {(−1; −1), (−1; 0), (0; −1), (0; 2), (0; 3), (1; −1), (1; 0), (1; 2), (1; 3),
(2; 2), (2; 3), (3; −1), (3; 0), (3; 2), (3; 3)}
c) 𝑅 ∪ 𝑆 = {(−1; −1), (−1; 0), (−1; 1), (−1; 3), (0; −1), (0; 1), (0; 2), (0; 3), (1; 1),
(2; 0), (2; 1), (2; 2), (2; 3), (3; −1), (3; 0), (3; 1), (3; 2), (3; 3)}
𝑅 ∩ 𝑆 = {(−1; 3), (2; 0)}
d) 𝑅 ∘ 𝑆 = {(−1; −1), (−1; 1), (−1; 2), (−1; 3), (0; −1), (0; 1), (0; 3), (2; −1),
(2; 0), (2; 1), (2; 2), (3; −1), (3; 0), (3; 1), (3; 2)}
7. Respuestas
a) 𝑀 𝑅̅ =
[
1 0 1 0 1
0 1 1 1 1
1 1 0 1 0
0 1 1 1…
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