CISC 102 Lecture Notes - Lecture 2: Subset, Triangular Number, Multiset
23 Sep 2016
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CISC 102 Full Course Notes
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A set may be viewed as any well-defined collection of objects, called elements or members of the set. This sentence defines in a mathematical sense the term set and the term element. Elements are well-defined, that is, each element can be distinguished from another. A set is an un-ordered collection of elements: can think of elements in a set as objects in a bag. A= {1,2,3} is a set of 3 elements. 1 a (1 is an element of the set of a) *tip b= {1,1,3,2} this implies: there was a mistake and an element was repeated, multi-set *not relevant to this course. You can think of a b in relation to something like a 7. 09/13/16: let x and y be two sets such that a x implies a y. We can say that x is a subset of y and notate it as x y. Suppose x and y are two sets such that:
