Update 'book-1/7.tex' #1

Manually merged

david merged 3 commits from split-to-1 into master

2020-01-06 09:04:57 -06:00

Author	SHA1	Message	Date
David Daily	ccbcef7662	Update 'book-1/9.tex'	2020-01-06 09:03:54 -06:00
David Daily	9ad0f8069b	Update 'book-1/8.tex'	2020-01-06 09:03:06 -06:00
David Daily	5e6206a92f	Update 'book-1/7.tex'	2020-01-06 09:01:25 -06:00