Can the Universal Set be Defined as the Union of Two Sets?

In summary, it is acceptable to define the universal set as the union of two sets if the theory does not involve the intersection of their complements relative to a larger set. However, if the axioms or logic are changed, a genuine universal set can be achieved.
  • #1
Kamataat
137
0
Let's say I have to prove something about two sets and I want to make use of the notion of the universal set. Is it OK then to define the universal set as the union of these two sets?

- Kamataat
 
Physics news on Phys.org
  • #4
Wouldn't you also have to union (in addition to the two sets) the intersection of the complements of the two sets?
 

What is a universal set?

A universal set is a set that contains all the elements or objects that are being considered in a particular problem or situation. It is often denoted by the symbol ∫.

Why do we use a universal set?

A universal set is used to define the scope of a problem or situation, and to ensure that all relevant elements or objects are included. It also helps in performing operations such as union, intersection, and complement of sets.

How is a universal set different from a null set?

A universal set is a set that contains all the elements being considered, while a null set is a set that contains no elements. In other words, a universal set is a superset of all other sets, while a null set is a subset of all other sets.

Can a universal set be infinite?

Yes, a universal set can be infinite, but it can also be finite. It depends on the problem or situation being considered. For example, in the set of all real numbers, the universal set is infinite, while in the set of all students in a class, the universal set is finite.

What happens if a universal set is not specified?

If a universal set is not specified, it can lead to ambiguity and confusion in solving a problem or situation. It is important to clearly define the universal set to ensure that all relevant elements or objects are considered in the problem.

Similar threads

  • Set Theory, Logic, Probability, Statistics
Replies
1
Views
760
  • Set Theory, Logic, Probability, Statistics
Replies
2
Views
1K
  • Set Theory, Logic, Probability, Statistics
Replies
2
Views
1K
  • Set Theory, Logic, Probability, Statistics
Replies
2
Views
2K
  • Set Theory, Logic, Probability, Statistics
Replies
5
Views
1K
  • Set Theory, Logic, Probability, Statistics
Replies
33
Views
3K
  • Set Theory, Logic, Probability, Statistics
Replies
3
Views
2K
  • Set Theory, Logic, Probability, Statistics
Replies
5
Views
1K
  • Set Theory, Logic, Probability, Statistics
Replies
13
Views
2K
  • Set Theory, Logic, Probability, Statistics
Replies
2
Views
2K
Back
Top