7/11/2015 Example 4.8.2 (late: 4.6.2) Corrected calculation.

 9/9/2015  Example (8.5.6)(10.4.6) dx --> du in display.

 9/11/2015 Example 14.5.4 (16.5.4) Fixed typos in display equation.

12/ 3/2015 Exercise 17.6.10 (19.6.20) Fixed wrong answer.

 1/ 4/2016 Clarify answer to 1.1.11

 2/ 5/2016 Add explicit definition of derivative to section 2.4.

 2/ 6/2016 Add explicit definition of lim f = \infty to section 4.10 (late: 4.7).

 2/22/2016 Fix answer to exercise 16.7.3 (18.7.3).

 4/12/2016 Fix exercises 9.8.7 (11.3.7), 9.8.9 (11.3.9).

 4/29/2016 Exercise 6.1.14, add information about units.