Added cross-referencing, corrected layout error
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Added multiple drawings, other

- Added drawings in chapter 9
- Added big brackets around some chunks of text
- Added updated PDF for chap 9 (source)
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fixed error in chapter 9
Fresh PDFs
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Fixed a typo in definition 3.43
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Merge pull request #32 from joelbu/master

Fixed a typo in definition 3.43
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typo fix chapter 7
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