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Changelog - textbook
March 28, 2018 -Tweaks to Section 4.4.1.
March 21, 2018 - Expanded Example 4.4.4.
March 18, 2018 - A few more tweaks to the part of Section 4.4 before Section 4.4.1.
March 16, 2018 - Inserted a new simpler Example 4.4.3 and otherwise polished the part of Section 4.4 before Section 4.4.1.
March 8, 2018 - Simplified the proof of the third part of Theorem 4.2.9 a tiny bit. Minor tweaks to section 4.3. Removed the word "optional"
from the titles of Examples 4.3.7 and 4.3.8.
February 26, 2018 - corrected some typos
January 31, 2018 - more minor corrections and tweaks
January 23, 2018 - corrected some typos
January 14, 2018 - labelled as optional those bits of section 2.3 involving field lines
January 10, 2018 - added a bit to section 1.4 and corrected some typos
January 7, 2018 - added a figure after Definition 1.3.1 and
enlarged Definition 1.4.1