8/22/2012: Removed exercises 25 and 26 from section 4.10 (21 and 22 in
            4.7 of late transcendentals(LT)) 
 8/31/2012: Third answer to 12.2.13 (14.1.13 LT) is <0,-12r>.
  9/6/2012: Fixed answer to 1.3.8, {x|x>=1 or x<0}
 9/22/2012: Section 16.3 (18.3 LT), last line before the exercises, 
            "P_z=R_x" --> "Q_z=R_y". In the same paragraph,
            "then then" --> "then"
10/10/2012: Remove exercise 14.8.18 (16.8.18 LT).
            Changes pagination by two pages starting
            with the next chapter.
10/20/2012: Move exercise 15.2.18 to 15.5, 15.2.19 to 15.5 &
            15.6. (All are chapter 17 LT.)
11/25/2012: Added missing right parenthesis to "h(x,y" in problem
            16.5.9 (18.5.9 LT).
12/03/2012: Removed extraneous x^3 from exercise 16.8.4 (18.8.4 LT)
12/15/2012: Minor typos in section 4.7, ET only.

12/26/2012: Changes above have been applied to the print versions at lulu.

  2/1/2013: Example 10.7: 1.318->\pi/3.