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Preface ix
Introduction 1
Linear and non-linear systems 1
Simultaneous linear equations: an economic example 2
Simultaneous linear equations: general systems 5
Summation notation 6
Exercises 8
Inequalities 10
Linear inequalities: graphical representation 12
Linear inequalities: an economic example 14
Exercises 16
Some concepts from set theory 17
Necessary and sufficient conditions 20
Exercises 22
Vectors 25
Vectors - the basic concepts 25
Vector operations 27
Exercises 30
Vector representation of simultaneous equations 31
Euclidean space and linear dependence 31
Exercises 36
Bases 37
Exercises 40
Matrices 42
The concept of a matrix 42
The first matrix operations 43
Exercises 45
Some particular matrix types 46
Exercises 51
Matrix multiplication - definition 51
Exercises 54
Some properties of matrix multiplication 55
Exercises 59
Summation notation again 60
Matrix multiplication and simultaneous equations 63
Exercises 68
Submatrices and partitioning 69
Transposition; symmetric and skew-symmetric matrices 72
Exercises 76
Elementary Operations and the Rank of a Matrix 80
Introduction 80
Elementary operations 81
Exercises 84
Echelon matrices 84
Exercises 89
Elementary operations and linear dependence 89
Exercises 91
The rank of a matrix 91
Product matrices and rank 94
Computing the rank of a matrix 98
Exercises 101
The Inverse of a Square Matrix 102
The concept of an inverse matrix 102
An approach to calculating the inverse matrix 103
Exercises 106
The existence of the inverse matrix 106
Some further properties of inverse matrices 112
Some computational aspects of finding the inverse 114
Exercises 117
Computation of the inverse by using partitioning 117
Exercises 122
The Solution of Simultaneous Linear Equations 125
Introduction 125
Exercises 128
A formal computational method 128
Exercises 132
Non-homogeneous equations: some general considerations 133
Exercises 138
Non-homogeneous equations: further discussion 139
Exercises 147
Homogeneous equations 147
Exercises 151
A summary of the results 152
A variant of the computational approach 153
Exercises 155
Some applied examples 156
Exercises 162
Integer Variables and Other Topics 165
Introduction 165
Basic solutions for linear equations 165
Exercises 169
An appreciation of linear programming 170
Exercises 175
Quadratic forms 175
Exercises 180
The need for integer-variable analysis 180
The single linear equation in one or two integer variables 182
Exercises 187
Larger systems of linear equations in integers 188
Exercises 189
General integer systems and computational approaches 190
Problems where the integer requirement is automatically satisfied 193
Exercises 195
Determinants 196
Solutions and Hints for Some of the Exercises 206
Suggestions for Further Reading 221
Index 223
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