Math 109
Terms
undefined, object
copy deck
 natural number
 [1,2,3,4,5,6...]
 whole numbers
 [0,1,2,3,4,5...]
 integers
 [...5,4,3,2,1,0,1,2,3,4,5...]
 rational numbers
 numbers whosse decimal representation is an integer, a terminating decimal, or a repeating decimal
 Set
 a collection of objects
 element
 anything inside a set is an element of that set
 equal sets
 if two or more sets have all of the same elements
 subset
 everything in set A is in set B. Everything in set B does not have to be in set A.
 proper subset
 if every element in set A is in set B but set A is not = to set B.
 complement of a set
 all element in the universal set that are not in the set beind examined.
 intersection of sets
 all elements that 2 or more sets have in common.
 union of sets
 all the elements in 2 or more sets combined
 difference of sets
 the set of all elements in one set that are not in another set.
 cartesian product of 2 sets
 AxB, All ordered pairs with A=X and B=Y
 cardinal number (or cardinality) of a set
 the number of elements in a set
 E
 is an element of

C
  can or cannot be equal sets
 C
 definitely equal sets
 how do you determine how many subsets a given set has?
 the # of subsets of a set with N elements is 2n.
 How do you determine how many proper subsets a given set has?
 the # of proper subsets of a set with n elements is 2n1