Feedback on chap-algebra

[omicron1100]

In reference to version 224734d7be7ff0c4a8adb3a206356ea122112f33

In chapter 1, there is a typo in the sentence introducing Section 1.2. "In Section 1.2, will" should probably read "In Section 1.2, we will". The next sentence also misspells "how" as "hnow".