We use the symbol to indicate that an object belongs to a set and the symbol to indicate that an object does not belong to a set. So in full formality the set would be written as. Objects placed within the.
In this section we look at some mathematical notation for the ideas we learnt about sets in the last section.
The same set could be described as xx is a counting number less than 10 in set-builder notation. The individual objects in a set are called the members or elements of the set. Then an odd integer being one more than a multiple of 2 is x 2m 1. A set is a well-defined collection of distinct objects.