Spelling fixes Chapter 1.1
get head
Merge branch 'master' of https://github.com/pennatil/Analysis-Notes

* 'master' of https://github.com/pennatil/Analysis-Notes:
  merging changes
  Some more spelling fixes
  Some Spelling Fixes
Fix speling chapter 1.3; add proof for commutativity
Merge pull request #8 from bimmlerd/Chap1.3

Merging chapter 1.3 corrections