Event (probability theory)
In probability theory, random events (or events) refer to a set of things that are given probability, that is, a subset of the sample space. In a random test, a particular event may or may not occur; but when the number of trials increases, we can observe a regular result, that is, random events. Basically, as long as the sample space is limited, any subset of the samples in the sample space can be called an event. However, when the sample space is infinite, especially when it is uncountable, it is often impossible to define all the subsets as random events. Therefore, in order to define a probability space, it is often necessary to remove some subsets of the sample space, specifying that they can not be events. ...