Apuntes Apuntes de Matem´ Mate m´ atica atica Discret Discretaa 7. Relaciones de Orden
Franc Fra ncis isco co Jos´ Jo s´ e Gonz´ Go nz´ alez al ez Guti´ Gu ti´ erre er rez z C´ adiz, adiz, Octubre de 2004
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Universidad de C´ adiz
Departamento de Matem´ aticas
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Lecci´ on on 7
Relaciones de Orden Contenido 7.1
7.2
7.3
7.4
Generalidades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
7.1. 7.1.1 1
Rela Relaci ci´ o ´n de Orden . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
7.1. 7.1.2 2
Rela Relaci ci´ o ´n de Orden Estricto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
7.1.3 7.1.3
Proposi Proposici´ ci´ on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
7.1.4 7.1.4
Proposi Proposici´ ci´ on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Conjuntos Or Ordenados . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
7.2.1
Elementos Comparables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
7.2.2
Orden Parcial y Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
7.2.3
Conjuntos Ordenados
Pro ducto
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
7.3.1
Orden del Producto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
7.3.2 7.3.2
Orden Orden Lexicog Lexicogr´ r´ afico . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Repres Represen entaci taci´ ´ on Gr Gr´ afica . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
7.4.1
Diagrama de Hasse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
7.5 7.5
Orde Ordena naci ci´ ´ on on Topol´ ogica . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
7.6 7.6
Elem Elemen ento tos s Carac Caracte ter r´ ısti ıstico cos s de un un Conj Conjun unto to Orde Ordena nado do . . . . . . . . . . . . . 177 177
7.6.1
Elemento Maximal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
7.6.2
Elemento Minimal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
7.6.3
Existen tencia del Ma Maximal y Minimal . . . . . . . . . . . . . . . . . . . . . . . . . 178
7.6.4 7.6.4
Algori Algoritmo tmo para para la la Ordena Ordenaci´ ci´ on on Topol´ ogica . . . . . . . . . . . . . . . . . . . . . 178
7.6. 7.6.5 5
Elem Elemen ento to M´ aximo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
7.6.6
Elemento M´ınimo
7.6.7 7.6.7
Unicid Unicidad ad del M´ aximo y el M´ınimo . . . . . . . . . . . . . . . . . . . . . . . . . 183
7.6.8
Cota Sup erior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
7.6.9
Cota Inferior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
7.6.10 Conjunto Acotado . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
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Universidad de C´ adiz
7.1 7.1
Departamento de Matem´ aticas
Gener General alid idad ades es
Una relaci´on on de orden es una relaci´on on definida en un conjunto que verifica las propiedades reflexiva, antisim´ antis im´etrica etri ca y transiti tran sitiva. va. Cuando en un conjunto hayamos definido una relaci´on on de orden, diremos que el conjunto est´a ordenado con respecto a dicha relaci´on. on. Los ret´ ret´ıculos y las ´algebras algebras de Boole son conjunto conjuntoss ordenados ordenados con caracter caracter´´ısticas ısticas especiales. especiales. Estas estructuras algebraicas juegan un importante papel en la teor´ teor´ıa de conjuntos, as´ı como en problemas de ordenaci´on o n y b´ usqueda usqueda (problemas ´estos de especial inter´ inter´es es en la inform´atica), atica), y en particular las algebras de Boole son importantes para la representaci´on de circuitos l´ogicos. ´ algebras ogicos. Antes de comenzar fijaremos ideas con un par de ejemplos sencillos. Ejemplo 7.1
Dado el conjunto A = {a,b,c}, consideramos la relaci´on on de inclusi´on on en el conjunto de
las partes de A. P (A) =
{∅, {a} , {b} , {c} , {a, b} , {a, c} , {b, c} , {a,b,c}}
La inclusi´on on es una relaci´on on de orden ya que posee p osee las propiedades reflexiva, antisim´ etrica etrica y transitiva. transitiva. Podemos, por tanto, ordenar el conjunto
P (A):
∅ ⊆ {a} ⊆ { a, b} ⊆ {a,b,c} ∅ ⊆ {b} ⊆ {a, b} ⊆ { a,b,c} y as´ as´ı sucesivamente. sucesivamente. Ahora bien, considerando dos elementos de P (A), por ejemplo {a} y {c}, ni {a} est´ a incluido en {c} ni {c} en {a}, luego la relaci´on on de inclusi´on on no sirve para ordenar todos los elementos de P (A), diremos en tal caso que este conjunto est´a parcialmente ordenado.
7.1. 7.1.1 1
Rela Relaci ci´ on o ´n de Orden
Una relaci´ on binaria R sobre un conjunto A se dice que es de orden, orden, si es reflexiva, reflexiva, antisim´ etrica etrica y transitiva.
Los ordenes ´ordenes m´as as comunes son las relaciones y en Z y en R. Por Por esta raz´ raz´ on cuando nos refiramos on en general a una relaci´on on de orden en un conjunto A, usaremos lo s´ımbolos y para R . Esto Estoss son similares a los y que seguiremos utilizando cuando el conjunto sea Z o R. Si es una relaci´on on de orden sobre un conjunto A, entonces a b se lee “a “ a precede a b” o “a es anterior a b”. Si a b y a = b, emplearem emplearemos os a b y diremos que “a “a precede precede estrictam estrictament entee a b” o “a es estrictamente anterior a b”. a b se lee “a “ a sucede a b” o “a es posterior a b” a b se lee “a “ a sucede estrictamente a b” o “a es estrictamente posterior a b” .
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Matem´ atica Discreta
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
o lo que es igual a b ⇐⇒ b − a ∈ Z0+ es decir, a b ⇐⇒ ∃ k ∈ Z0+ : b − a = k Veamos si esta relaci´on on cumple las condiciones exigidas. Reflexividad . En efecto, sea a elegido arbitrariamente en el conjunto de los enteros. Entonces,
a = a =⇒ a − a = 0; 0 ∈ Z0+ =⇒ a a Antis Ant isim imet etr´ r´ıa ıa . Sean a y b dos enteros cualesquiera. Entonces,
a b ⇐⇒ ∃k1 ∈ Z0+ : b − a = k1 y b a ⇐⇒ ∃k2 ∈ Z0+ : a − b = k2 por lo tanto,
=⇒ k1 = −k2 , con k1 y k2 en Z0+ =⇒ k1 = k2 = 0
b−a =0 y a−b =0 es decir, a=b y, consecuentemente, la relaci´on es antisim´ antis im´etrica. etri ca. Transitividad . En efecto, si a, b y c son tres n´ umeros enteros cualesquiera. Entonces umeros
a b ⇐⇒ ∃k1 ∈ Z0+ : b − a = k1 y bc
⇐⇒ ∃k2 ∈ Z0+ : c − b = k2
=⇒ b − a + c − b = k1 + k2 k1 , k2 ∈ Z0+ =⇒ c − a = k, k = k1 + k2 ∈ Z0+ =⇒ a c.
Por lo tanto, la relaci´on es transitiva.
7.1. 7.1.2 2
Rela Relaci ci´ o on ´n de Orden Estricto
Una relaci´ on R sobre un conjunto A se dice que es de orden estricto si es asim´ etrica etrica y transitiva. transitiva. Ejemplo 7.3
Probar que la relaci´on on “menor que” es una relaci´on on de orden estricto en Z.
Soluci´ on on Sean a y b dos enteros cualesquiera. Entonces,
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Universidad de C´ adiz
Departamento de Matem´ aticas
Asim As imet etr´ r´ıa ıa . En efecto, si a y b son dos enteros cualesquiera.
a< b
⇐⇒ ∃k ∈ Z+ : b − a = k ⇐⇒ ∃k ∈ Z+ : a − b = −k ⇐⇒ a − b ∈ / Z+ ⇐⇒ a − b = k ; ∀k ∈ Z+ =⇒
ba
Por lo tanto, la relaci´on propuesta propuest a es asim´etrica. etrica. umeros enteros cualesquiera. Entonces umeros Transitividad . En efecto, si a, b y c son tres n´
a< b
⇐⇒ ∃k1 ∈ Z+ : b − a = k1
y b< c
⇐⇒ ∃k2 ∈ Z+ : c − b = k2
=⇒ b − a + c − b = k1 + k2 k1 , k2 ∈ Z+ =⇒ c − a = k, k = k1 + k2 ∈ Z+ =⇒ a < c.
Por lo tanto, la relaci´on es transitiva.
Observemos que la relaci´on on de orden definida en Z como “menor o igual” puede definirse a trav´es es de la relaci´ rela ci´on on de orden estricto “menor que”. En efecto, si a y b son dos enteros arbitrarios,
Nota 7.1
a b ⇐⇒ a < b ∨ a = b
y tambi ta mbi´´en en
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Matem´ atica Discreta
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
menor o igual que b o b no es menor o igual que a. En efecto,
0 a = b ⇐⇒ b − a = ⇐⇒ b − a ∈ Z \ {0} ⇐⇒ b − a ∈ Z ∪ Z+ −
⇐⇒
⇐⇒
⇐⇒
⇐⇒
⇐⇒
b−a ∈Z
−
∨ b − a ∈ Z+ b−a ∈Z
−
∨ a−b∈Z
−
b−a = k ; ∀k ∈ Z+
∨ a−b = k ; ∀k ∈ Z+ ba
∨ ab ba
∨ ab
A continuaci´on on veremos que a partir de una relaci´on on de orden puede definirse una de orden estricto y viceversa.
7.1. 7.1.3 3
Propo Proposi sici ci´ on o ´n
Sea una relaci´ on de orden definida sobre un conjunto A y sea otra relaci´ on sobre A definida en
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Universidad de C´ adiz
Departamento de Matem´ aticas
lo cual es imposible. Por lo tanto, es asim´ as im´etric et rica. a. Transitiva. En efecto, sean a, b y c tres elementos arbitrariamente elegidos en A. Pues bien, si ab ∧ bc por (7.1), tendremos que (a b ∧ a = b) ∧ (b c ∧ b = c) es decir, (a b ∧ b c) ∧ (a =b ∧ b = c) . Veamos que si a =b ∧ b = c, entonces a = c. En efecto, si fuese a = c, tendr´ ten dr´ıamos ıam os (a b ∧ b a) ∧ (a =b ∧ b = a) lo cual, por la antisimetr´ a ntisimetr´ıa ıa de nos llevar´ llevar´ıa a la contradicci´on, a=b ∧ a = b. As´ı pues pu es,, ( a b ∧ b c) ∧ a =c y por la transitividad de , resulta ac ∧ a =c es decir, ac y, consecuentemente, es transitiva.
7.1. 7.1.4 4
Propo Proposi sici ci´ on o ´n
Sea una relaci´ relaci´ on de orden orden estricto estricto definida definida sobre sobre un conjun conjunto to A y sea otra relaci´ on sobre sobre A definida en la forma a b si, y s´ olo si a b ´ o a = b. Entonces es una relaci´ on de orden sobre A.
Demostraci´ on on
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Matem´ atica Discreta
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
entonces, por (7.2), (a b ∨ a = b) ∧ (b a ∨ a = b) ∧ (a = b) es decir, [(a [(a b ∧ b a) ∨ (a = b)] ∧ (a = b) pero a b y b a contradice la asimetr´ıa ıa de , luego (a = b) ∧ (a = b) lo cual es una contradicci´on, on, por lo tanto es antisim´ antis im´etrica. etri ca. Transitiva. En efecto, sean a, b y c tres elementos arbitrarios de A. Pues bien, si ab ∧ bc entonces por (7.2), (a b ∨ a = b) ∧ (b c ∨ b = c) de aqu´ı que qu e (a b ∧ b c) ∨ (a b ∧ b = c) ∨ (a = b ∧ b c) ∨ (a = b ∧ b = c) y por ser transitiva, transiti va, nos quedar´ıa ıa que (a c) ∨ (a c) ∨ (a c) ∨ (a = c) es decir, ac ∨ a=c por lo tanto, y de nuevo por (7.2), a c.
7.2 7.2 7.2.1 7.2.1
Conj Conjun untos tos Ordena Ordenados dos Elemen Elementos tos Comparab Comparables les
Dados dos elementos a y b de un conjunto A sobre el que se ha definido una relaci´ on de orden , diremos diremos que son comp compar arables ables si uno de ellos es anterior anterior al otro. otro. En caso contra contrario rio se dice dice que a y b son “no comparables”.
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Universidad de C´ adiz Ejemplo 7.4
Departamento de Matem´ aticas
Probar que la relaci´on on de orden “menor o igual” definida en el conjunto Z de los n´ umeros umeros
enteros es total. Soluci´ on on En efecto, sean a y b dos enteros cualesquiera, veamos que a b o b a, es decir, todos los n´umeros umeros enteros son comparables por la relaci´on. on. Como a y b est´ an arbitrariamente elegidos, puede ocurrir que sean iguales o distintos. Pues bien, an
0 a=b ∨ a = b ⇐⇒ a = b ∨ b − a = ⇐⇒ a = b ∨ b − a ∈ Z \ {0} ⇐⇒ a = b ∨ b − a ∈ Z ∪ Z+ −
⇐⇒ a = b ∨
⇐⇒ a = b ∨
⇐⇒ a = b ∨
∃k ∈ Z : b − a = k −
∨ ∃k ∈ Z+ : b − a = k a − b = −k, con − k ∈ Z+
∨ b − a = k, con k ∈ Z+ b< a
∨ a< b
a = b ∨ b< a
⇐⇒
∨
a = b ∨ a< b
ba
⇐⇒
∨
ab
Por tanto, la relaci´on on de orden “menor o igual” definida en el conjunto de los n´umeros umeros enteros es total.
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Matem´ atica Discreta
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
luego,
∃k ∈ Z+ : a = a · k de aqu´ı que
∀a a ∈ Z+ =⇒ a a es decir, la relaci´on on de divisibil divisibilidad idad es, en efecto, reflexiva . Antis Ant isim´ im´etri et rica ca . Sean a y b dos elementos cualesquiera de
ab ∧ ba
Z+ , entonces
∃k1 ∈ Z+ : b = a · k1 ∧ ∃k2 ∈ Z+ : a = b · k2
⇐⇒
si ahora sustituimos la segunda ecuaci´on on en la primera, primera, tendremos tendremos b = b · k1 · k2 ⇐⇒ k1 · k2 = 1 ⇐⇒ k1 = k2 = 1 consecuentemente, a = b. De aqu´ı que
∀a, b ∈ Z (a b ∧ b a =⇒ a = b) es decir, la relaci´on on propuesta es anti an tisi sim´ m´ etri et rica ca . umeros enteros arbitrarios. umeros Transitiva . Sean a, b y c tres n´ ab ∧ bc
⇐⇒
∃k1 ∈ Z+ : b = a · k1 ∧ ∃k2 ∈ Z+ : c = b · k2
Sustituyendo la segunda ecuaci´on on en la primera, tendremos que c = a · k1 · k2 : k1 · k2 ∈ Z luego, ac o sea,
∀a,b,c ∈ Z (a b ∧ b c =⇒ a c) la relaci´on, on, por tanto, es transitiva .
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Universidad de C´ adiz
Departamento de Matem´ aticas
(a) A = Z y a R b ⇐⇒ a = 2b 2b umero entero, entonces 1 = umero 2 · 1, luego 1 R / 1, de aqu´ı que Reflexiva . Consideremos el 1, n´
∃a : a ∈ Z ∧ a R /a La relaci´on on propuesta no es, por tanto, reflexiva y, consecuentemente, no es de orden. (b) A = Z y a R b ⇐⇒ a2 |2b umero entero 3, entonces Reflexiva . Consideremos el n´umero 32 no divide a 2 · 3 de aqu´ı que 3 R / 3, es decir,
∃a : a ∈ Z ∧ a R /a por tanto, al igual que en el apartado anterior, la relaci´on propuesta es no reflexiva y, consecuentemente, no es de orden. (c) A = Z y a R b ⇐⇒ ∃ k ∈ Z : a = bk umero umero entero a, se verifica que a = a1 , luego Reflexiva . Dado cualquier n´
∃k ∈ Z+ (k = 1) : a = ak de aqu´ı que
∀a (a ∈ Z =⇒ a R a)
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Matem´ atica Discreta
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
Por tanto, la relaci´on on es de orden. Veamos de que tipo es. Tomando los enteros 2 y 3, se verifica que
3 k , ∀k ∈ Z+ y 3 = 2 k , ∀k ∈ Z+ 2= luego, 2 R / 3 ∧ 3 R /2 es decir,
∃a, b ∈ Z : (a ( a R / b ∧ a R / b) es decir, existen en Z elementos no comparables con la relaci´on on propuesta, de aqu´ aqu´ı que esta sea de orden parcial . Determinar si la relaci´on on de inclusi´on on definida en el conjunto A = P (S ), ), donde S es un conjunto cualquiera es una relaci´on on de orden total.
Ejemplo 7.7
Soluci´ on on A = P (S ), ), donde S es un conjunt conjunto o cualquier cualquiera a y R la inclusi´on on de conjuntos. Esta relaci´on on es claramente reflexiva, antisim´ a ntisim´etrica etrica y transitiva tran sitiva (ver lecci´ l ecci´on de teor´ teor´ıa de conjuntos), luego es de orden. El siguiente ejemplo prueba que el orden es parcial. En efecto, sea S = {a,b,c} y P (S ) =
{∅, {a} , {b} , {c} , {a, b} , {a, c} , {a,b,c}}
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Universidad de C´ adiz
7.3.1 7.3.1
Departamento de Matem´ aticas
Orden Orden del del Produ Producto cto
Si (A, 1 ) y (B, 2 ) son dos conjuntos parcialmente ordenados, entonces {A × B, } tambi´ tam bi´en en lo es con el orden definido por
(a, b) (a , b ) ⇐⇒ a 1 a ∧ b 2 b Demostraci´ on on
Veamos que la relaci´on on definida cumple las tres condiciones condiciones que caracteriz caracterizan an las relaciones relaciones de orden. orden. (a, b) un elemento arbitrario de A × B . Entonces Reflexiva . Sea (a, (a, b) ∈ A × B
⇐⇒ a ∈ A ∧ b ∈ B =⇒
a 1 a ∧ b 2 b {Reflexividad en (A, (A, 1 ) y {B, 2 }}
⇐⇒ (a, b) (a, b) luego,
∀(a, b) [(a, [(a, b) ∈ A × B =⇒ (a, b) (a, b)] es decir, la relaci´on on propuesta es, en efecto, reflexiva. (a, b) y (a , b ) dos elementos cualesquiera de A × B . Entonces, Antis Ant isim´ im´etri et rica ca . Sean (a,
(a, b) (a , b ) ∧ (a , b ) (a, b)
⇐⇒
a 1 a ∧ b 2 b ∧ a 1 a ∧ b 2 b
a 1 a ∧ a 1 a en A
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Matem´ atica Discreta
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
Por tanto, la relaci´on on definida en el producto cartesiano A × B es de orden. Lo llamaremos llamaremos el orden del producto. Ejemplo 7.9
En Z+ × Z+ y definimos la siguiente relaci´on:
(a, b) (a , b ) ⇐⇒ a |a ∧ b b
donde es el orden usual. Demuestre que es de orden. Soluci´ on on Recordemos que la relaci´on on de divisibilidad “ |” sobre el conjunto de los enteros positivos, es de orden parcial. Veamos si la relaci´on on propuesta es de orden. (a, b) un elemento arbitrario de A × A. Entonces, Reflexiva . Sea (a, a |a , por ser “|” reflexiva ∧ b b, por ser “” reflexiva luego, (a, b) (a, b) es decir,
∀(a, b) ((a, ((a, b) ∈ A × A =⇒ (a, b) (a, b)) o sea, es reflexiva . ( a, b) y (a b ) cualesquiera de A × A Antis Ant isim´ im´etri et rica ca . Sean (a,
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Universidad de C´ adiz
Departamento de Matem´ aticas
As´ı pues pu es,,
∀(a, b), (a , b ), (a , b ) ∈ A × A ((a, ((a, b) (a , b ) ∧ (a , b ) (a , b ) =⇒ (a, b) (a , b )) es decir, es transitiva .
Consecuentemente, la relaci´on on propuesta es de orden, siendo ´este parcial por serlo la relaci´on on de divisi bilidad.
7.3.2
Orden Lexicogr´ afico afico
Un orden muy ´ util en el producto A × B , siendo (A, 1 ) y (B, 2 ) dos conjuntos parcialmente ordenados, es el definido de la forma siguiente:
(a, b) (a , b ) ⇐⇒ a 1 a ∨ (a = a ∧ b 2 b ) =a. donde a 1 a si a 1 a y a
Demostraci´ on on Veamos que esta relaci´on on es, en efecto, una relaci´on on de orden
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Matem´ atica Discreta
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
( a, b), (a , b ) y (a , b ) tres elementos cualesquiera de A × B . Entonces, Transitiva . Sean (a,
(a, b) (a , b )
∧ (a , b ) (a , b )
⇐⇒
⇐⇒
a 1 a ∨ (a = a ∧ b 2 b )
∧ a 1 a
∨ (a = a
∧ b 2 b )
(a 1 a ∧ a 1 a )
∨ (a 1 a ) ∧ (a = a
∧ b 2 b )
∨ (a = a ∧ b 2 b ) ∧ (a 1 a )
∨
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Universidad de C´ adiz
Departamento de Matem´ aticas
En efecto, sean (a, ( a, b) y (a , b ) cualesquiera de A × B . Como 1 es de orden total
a 1 a ∨ a 1 a es decir,
(a 1 a ∨ a = a ) ∨ (a 1 a ∨ a = a) luego
a 1 a ∨ a 1 a ∨ a = a . Pues bien, si a 1 a , entonces (a, (a, b) (a , b )
si a 1 a, entonces (a (a , b ) (a, b)
si a = a , entonces como 2 es de orden total
b 2 b , luego (a, (a, b) (a , b )
∨
luego (
)
(
)
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Matem´ atica Discreta
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
El ordenamiento lexicogr´afico afico puede extenderse f´acilmente acilmente al producto cartesiano A1 × A2 × · · · × An en la forma siguiente:
Nota 7.4
(a1 , a2 , . . . , an ) (a1 , a2 , . . . , an ) ⇐⇒
a1 a1 ∨ a1 = a1 ∧ a2 a2 ∨ a1 = a1 ∧ a2 = a2 ∧ a3 a3 ∨ ············ ∨ a1 = a1 ∧ a2 = a2 ∧ · · · ∧ an
−1
= an
−1
∧ an an
La primera coordenada predomina excepto para la igualdad, en cuyo caso se examina la segunda coordenada. Si la igualdad igualdad se mantiene mantiene nuevamen nuevamente, te, se pasar´ pasar´a a la siguiente coordenada y as´ as´ı sucesivamente. sucesivamente.
{
}
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Departamento de Matem´ aticas
amando amante ∗
en Σ ya que amando amante en Σ6 . Obs´ Obs ´erves erv esee que ama amando y
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Matem´ atica Discreta
7.4 7.4 7.4.1 7.4.1
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
Repr Represe esen ntaci taci´ on o ´n Gr´ afica afica Diagr Diagram ama a de Hasse Hasse
Dada una relaci´ on de orden, , sobre un conjunto A, un diagrama de Hasse es un grafo dirigido de la misma simplificado seg´ un los criterios siguientes:
1. Dado que toda relaci´on on de orden es reflexi reflexiv va, en cada punto punto de su digraf digrafo o habr´ habr´a un bucle. Simplificaremos el dibujo elimin´andolos todos. 2. Como toda toda relaci´ relaci´on on de orden es transitiva, suprimimos todos los arcos del digrafo que se obtenga al hallar el cierre cierre transitivo transitivo de los restantes. restantes. De esta forma, forma, si a b y b c, se sigue que a c. En este caso omitiremos la arista que va desde a hasta c y mantendremos las que van desde a hasta b y desde b a c. 3. Al igual que en un digrafo, cada punto de A lo representamos por un punto del plano, aunque
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Universidad de C´ adiz
Departamento de Matem´ aticas
y el diagrama de Hasse del conjunto parcialmente ordenado {P (A), ⊆} es:
{a,b,c}
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Matem´ atica Discreta
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
a •
4 •
• 5
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Universidad de C´ adiz
Departamento de Matem´ aticas
Describir las parejas ordenadas de la relaci´on determinada por el siguiente diagrama de Hasse de en el conjunto A = {1, 2, 3, 4}.
Ejemplo 7.17
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Matem´ atica Discreta
Francisco Jos´ e Gonz´ alez ale z Guti´ Gut i´ errez erre z
5 •
4
5 •
4 •
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Universidad de C´ adiz
30 •
Departamento de Matem´ aticas
32 •
72 •
16 •
36 •
60 • 12
• 30
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