Difference between revisions of "Boolean lattice"
I like pie (talk | contribs) m |
|||
(One intermediate revision by one other user not shown) | |||
Line 1: | Line 1: | ||
− | |||
− | |||
Given any [[set]] <math>S</math>, the '''boolean lattice''' <math>B(S)</math> is a [[partially ordered set]] whose elements are those of <math>\mathcal{P}(S)</math>, the [[power set]] of <math>S</math>, ordered by inclusion (<math>\subset</math>). | Given any [[set]] <math>S</math>, the '''boolean lattice''' <math>B(S)</math> is a [[partially ordered set]] whose elements are those of <math>\mathcal{P}(S)</math>, the [[power set]] of <math>S</math>, ordered by inclusion (<math>\subset</math>). | ||
− | When <math>S</math> has a finite number of elements (say <math>|S| = n</math>), the boolean lattice associated with <math>S</math> is usually denoted <math>B_n</math>. Thus, the set <math>S = \{1, 2, 3\}</math> is associated with the boolean lattice <math>B_3</math> with elements <math>\emptyset, \{1\}, \{2\}, \{3\}, \{1, 2\}, \{1, 3\}, \{2, 3\}</math> and <math>\{1, 2, 3\}</math>, among which <math>\emptyset</math> is smaller than all others, <math>S = \{1, 2, 3\}</math> is larger than all others, and the other six elements satisfy the relations <math>\{1\}, \{2\} \subset \{1,2\}</math>, <math>\{1\}, \{3\} \subset \{1,3\}</math>, <math>\{2\}, \{3\} \subset \{2,3\}</math> and no others. | + | When <math>S</math> has a [[finite]] number of elements (say <math>|S| = n</math>), the boolean lattice associated with <math>S</math> is usually denoted <math>B_n</math>. Thus, the set <math>S = \{1, 2, 3\}</math> is associated with the boolean lattice <math>B_3</math> with elements <math>\emptyset, \{1\}, \{2\}, \{3\}, \{1, 2\}, \{1, 3\}, \{2, 3\}</math> and <math>\{1, 2, 3\}</math>, among which <math>\emptyset</math> is smaller than all others, <math>S = \{1, 2, 3\}</math> is larger than all others, and the other six elements satisfy the relations <math>\{1\}, \{2\} \subset \{1,2\}</math>, <math>\{1\}, \{3\} \subset \{1,3\}</math>, <math>\{2\}, \{3\} \subset \{2,3\}</math> and no others. |
The [[Hasse diagram]] for <math>B_3</math> is given below: | The [[Hasse diagram]] for <math>B_3</math> is given below: | ||
Line 9: | Line 7: | ||
{{image}} | {{image}} | ||
+ | Every boolean lattice is a [[distributive lattice]], and the poset operations [[meet]] and [[join]] correspond to the set operations [[union]] and [[intersection]]. | ||
+ | |||
+ | {{stub}} | ||
− | + | [[Category:Definition]] |
Latest revision as of 22:46, 20 April 2008
Given any set , the boolean lattice
is a partially ordered set whose elements are those of
, the power set of
, ordered by inclusion (
).
When has a finite number of elements (say
), the boolean lattice associated with
is usually denoted
. Thus, the set
is associated with the boolean lattice
with elements
and
, among which
is smaller than all others,
is larger than all others, and the other six elements satisfy the relations
,
,
and no others.
The Hasse diagram for is given below:
An image is supposed to go here. You can help us out by creating one and editing it in. Thanks.
Every boolean lattice is a distributive lattice, and the poset operations meet and join correspond to the set operations union and intersection.
This article is a stub. Help us out by expanding it.