Basic Concepts and Notation

نویسنده

  • Gabriel Robins
چکیده

A set is formally an undefined term, but intuitively it is a (possibly empty) collection of arbitrary objects. A set is usually denoted by curly braces and some (optional) restrictions. Examples of sets are {1,2,3}, {hi, there}, and {k | k is a perfect square}. The symbol ∈ denotes set membership , while the symbol ∉ denotes set non-membership ; for example, 7∈{p | p prime} states that 7 is a prime number, while q∉{0,2,4,6,...} states that q is not an even number. Some common sets are denoted by special notation:

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تاریخ انتشار 1999