Symbols and notation
Union and intersection symbols
Union combines everything belonging to either set, while intersection keeps only elements belonging to both sets.
In one sentence
What does Union and intersection symbols mean?
Union combines everything belonging to either set, while intersection keeps only elements belonging to both sets.
How it is written
A∪B; A∩B
A compact example
If A={1,2} and B={2,3}, then A∪B={1,2,3} and A∩B={2}.
Other names and search terms
∪, ∩, union, intersection, set symbols.
Where this fits
When should you learn Union and intersection symbols?
The first encounter is not the final level. Many ideas begin visually, become computational in high school and become formal in college.
- 1Pre-high schoolPrepare foundations
- 2High schoolUsually introduced
- 3CollegeGreater depth
- 4AdvancedGreater depth
- Mathematical notation
- Algebra
- Reading equations
- Fluent formula reading
- Advanced mathematics
Recognising notation reduces friction when formulas become denser.
Open the Zero-to-QM pathClear answers
Questions about Union and intersection symbols
What does Union and intersection symbols mean in mathematics?
Union combines everything belonging to either set, while intersection keeps only elements belonging to both sets.
How is Union and intersection symbols written?
A common notation is A∪B; A∩B.
What is an example of Union and intersection symbols?
If A={1,2} and B={2,3}, then A∪B={1,2,3} and A∩B={2}.