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2.1-2 Set Notation

# 2.1-2 Set Notation - 2.1 Basic Set Concepts Sets A set is a...

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2.1: Basic Set Concepts Sets: A set is a collection or group of objects, called elements, that can be clearly defined. Capital letters are used to name sets and the elements of the set are enclosed in braces. Three methods of representing the elements of a set are [a] word description , where the elements are described in words (Set N is the set of natural numbers); [b] roster method, where each element is listed separated by commas: V = {x, y, z}; N = {1, 2, 3, …}; and [c] set-builder notation would describe the natural numbers as N = {x x I, and x > 0}, read N is the set of all x such that x is a natural number . The symbol is used to indicate that an object is a member of a set, and the symbol indicates that an object is not an element of a set. Examples: x V, m V. The empty set or null set is the set that contains no elements and is represented by {} or Φ; it is a subset of every set. A set is finite if the number of elements of the set can be counted (0 elements, 5 elements, etc.). It is infinite if the number of elements continues to infinity, like the Natural numbers: N = {1, 2, 3, …}. The three dots indicates that the elements continue in the same pattern. 1. Use all three types of set notation to show the set of whole numbers, W.

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