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what are basic set notation. The set of all positive numbers less than 10. Set notation uses curly brackets which are sometimes referred to as braces.
A b c d e f etc. A set is given a name usually an uppercase letter. If A 1 3 5 then 1 A and 2 A.
If an object z is not an element of set A we write z A.
It is not the case however that given any formula fx y1 yn and sets B1 Bn one can. If A 1 2 3 and B 1 2 4 5 then A B 1 2 3 4 5. Set theory begins with a fundamental binary relation between an object o and a set AIf o is a member or element of A the notation o A is used. The set of all great mathematicians in the past.