Appendix B
Linear Algebra
B.1 Systems of Linear Equations
A system of 
linear equations in 
unknowns looks like this:
The 
's are unknowns and 
and 
are constants. To put this in simpler form, we form matrices and define matrix multiplication.
B.2 
Notice that matrix 
has 
rows and 
columns; its size is denoted as . Matrix is a column matrix and has size . Matrix is also a column matrix ...
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