math

• This refers to a well-defined collection of objects


  Set
• This is the number of elements in a set


  Cardinality
• This is the operation on set that elements that are in both sets


  Union
• This is the operation on sets that containing the elements in both sets


  Intersection
• In the basic idea of sets, how can we describe one?


  Set refers to well-defined collection of objects
• In the basic ideas of sets, how do we get the cardinal number of a set?

  Count the number of elements in the sets
• In the operation of set, how do we perform union of two sets?

  List down all the elements of the two sets
• Proper Subsets of B = {dog, cat, mouse}


  {dog} {cat}
• Union Set: {1, 2, 3, 4, 5, 6}


  {1, 2, 3} {1, 3, 5}
• Set of natural numbers between 1 and 10

  Set of consonants in the English Alphabet

  Set of Grade 7 students of OLPS of school year 2022-2023

  Well-defined sets
• Rational Numbers


  Integers, Whole numbers, Natural numbers
• -5, 5, 15


  Integers
• Roster Method; Set builder notation; Verbal description Method


  Ways of describing a set
• -15; 45; -99; 23

  Integers
• 1/2; 1/3; 1/9; 2/7

  Rational numbers
• 0.35; 0.50; 0.74; 0.95

  Rational numbers
• L = {x | x is a heavenly body}

  E = {x | x is a letter in the word "Phillipines"

  Set-builder notation