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 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 2n-1