What it means
A ∩ B is what A and B have in common. In probability it is the event that both happen.
Read aloud in real formulas
P(A ∩ B) = P(A) P(B)
Aethel says
P of A intersection B equals P of A, times P of B
A and B are independent
A ∩ B = ∅
Aethel says
A intersection B equals the empty set
A and B have nothing in common
Typing it
- LaTeX
- \cap
- Unicode
- U+2229
Questions
How do you say ∩ out loud?
It is usually read “intersection”, and also “intersect”.
What does ∩ mean in maths?
A ∩ B is what A and B have in common. In probability it is the event that both happen.
How do you type ∩?
In LaTeX, write \cap. Its Unicode code point is U+2229.