Removed spurious index entry in toc
Maksim Otstavnov suggested change to definition of arithmetic progression
More proofreaders
Fixed typo on page 23
First draft of the second chapter
Draft of the second quiz
Grigoriy Mikhalkin found an indexing error in the condensation proof
Clarifying the statement of theorem about geometric series
Robert Pohl suggested an improvement
Edits from Donald Fincher