Chapter 9
Matrix Algebra
Thus far, we have been doing algebra involving numbers and functions. It is also possible to apply the operations of algebra to more general types of mathematical entities. In this chapter, we will deal with matrices, which are ordered arrays of numbers or functions. For example, a matrix which we designate by the symbol 
can represent a collection of quantities arrayed as follows:
(9.1)
The subscripts 
and on the matrix ...
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