Event in a sample space ↩

aliases:


Event in probability theory

An event is a subset of , the sample space, i.e. .

Special cases

• the whole sample space is called the certain or sure event
• the empty set is the null event

Combining events

We can combine events with the usual set operations:

• complement to get a collection of outcomes not in the event
• intersection of two events to get their common outcomes when both are true
• union of two events to get the outcomes when at least one of them is true, possibly both