What it means
A ∪ B is everything in A, in B or in both. In probability it is the event that A or B happens.
Read aloud in real formulas
P(A ∪ B) = P(A) + P(B) − P(A ∩ B)
Aethel says
P of A union B equals P of A, plus P of B, minus P of A intersection B
the probability that A or B happens
Typing it
- LaTeX
- \cup
- Unicode
- U+222A
Questions
How do you say ∪ out loud?
It is usually read “union”.
What does ∪ mean in maths?
A ∪ B is everything in A, in B or in both. In probability it is the event that A or B happens.
How do you type ∪?
In LaTeX, write \cup. Its Unicode code point is U+222A.