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Nov 28

Alternate notation: A B. In the next two chapters we will see that probability and statistics are based on counting the elements in sets and manipulating set operations. a = c. Transitivity . It is quite clear that most of these laws resemble or, in fact, are analogues of laws in basic algebra and the algebra of propositions. 2. The set di erence of A and B is the set AnB = fx : x 2A^x 62Bg. This book is directed more at the former audience This study leads to the definition of modified addition and multiplication operations on certain finite subsets of the integers. Once a few basic laws or theorems have been established, we frequently use them to prove additional theorems. These are fundamental notions that will be used throughout the remainder of this text. function from the set of real numbers into X or there is a one-to-one function from X into the set of rational numbers. The axioms of "equality" a = a Reflexive or Identity. Set Operations and the Laws of Set Theory The union of sets A and B is the set A[B = fx : x 2A_x 2Bg. Statement (2) is true; it is called the Schroder-Bernstein Theorem. Our approach is based on a widely used strategy of mathematicians: we work with specific examples and look for general patterns. It is used by the pure mathematician and by the mathematically trained scien-tists of all disciplines. troduction to abstract linear algebra for undergraduates, possibly even first year students, specializing in mathematics. This section discusses operations on sets and the laws governing these set opera-tions. Subsection 4.2.2 Proof Using Previously Proven Theorems. Basic Laws of Set Theory. If . The intersection of sets A and B is the set A\B = fx : x 2A^x 2Bg. The symmetric di erence of A and B is A B = (AnB)[(B nA). 3 The algebra of classes 4 Ordered pairs Cartesian products 5 Graphs 6 Generalized union and intersection 7 Sets Chapter 2 Functions 1 Introduction 2 Fundamental concepts and definitions 3 Properties of composite functions and inverse functions 4 Direct images and inverse images under functions 5 Product of a family of classes 6 The axiom of replacement Chapter 3 Relations 1 … Laws of Algebra 1) Idempotent Laws: Let A be a set A A = A A A = A 2) Identity Laws: Let A be a set and U be a Universal set A = A A U = A 3) Commutative Laws: Let A and B be sets A B = B A A B = B A 4) Associative Laws: Let A , B and C be sets A (B C) = (A B) C INTRODUCTION ficult to prove. The commutative rules of addition and multiplication These are the "rules" that govern the use of the = sign. b = c, then . If a = b, then b = a. Symmetry. a = b. and . They won’t appear on an assignment, however, because they are quite dif-7. The Formal Rules of Algebra Summary of the formal rules of algebra on the set of real numbers 1. Linear algebra is one of the most applicable areas of mathematics. 8 CHAPTER 0. After exploring the algebra of sets, we study two number systems denoted Zn and U(n) that are closely related to the integers.

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