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# Set Notation

Sets are usually denoted by capital letters A, B, C, X, Y, ...
And the elements in the sets are usually denoted by lower case letters a, b, c, x, y, ....

For example

If A is a set and x is an element of the set A, we write x 'âˆˆ' A (read as "x belongs to A"). If x is not an element of the set A, we write x 'âˆ‰' A (read as "x does not belong to A".)

The symbol 'âˆˆ' known as epsilon means 'belongs to'.