SETS
WHAT İS SET
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sets is a collection of objects whose elements are well-defined. and these elements can be numbers or objects
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set theory
Set theory is a branch of mathematical logic that studies sets, which informally are collections of objects. Although any type of object can be collected into a set, set theory is applied most often to objects that are relevant to mathematics. The language of set theory can be used to define nearly all mathematical objects.
and problems with sets can be prepared.
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some symbols
A ⊆ B - Subset: every element of A is in B.
A ⊂ B - Proper Subset: every element of A is in B,
but B has more elements.
A ∩ B - Intersection: in both A and B
A ⊄ B - Not a Subset: A is not a subset of B
A ∪ B - Union: in A or B (or both)
A ⊅ B - Not a Superset: A is not a superset of B
element concept. number of elements
resources
wikipedia
Eokultv
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Each of a set of objects is called an element of that set. Sets are usually named with capital letters such as A, B, and C. If an element x is an element of the set A, we write it in the form x e A and read as “x is element A.” Members of an element x set A write this as x 4 and read as “A is not an element of x”. The number of elements of a set is denoted by s (A).
