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2010-05-06:
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Typo:  Example 5.8, fixed the scale on the y-axis in Figure 5.2.6
Typo:  Example 5.10, fixed the last sentence
Typo:  Appendix A, added a degrees symbol after the value of angle A in the answer to Exercise 1 from Section 2.3


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2010-03-12:
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New:  Version 1.1 is released
New:  New section (6.4) on Polar Coordinates
New:  Added a short Sage example at the end of Section 6.2
New:  New format for examples and page headers
Typo:  Section 2.2, corrected the statement of Exercise 17


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2009-12-16:
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New:  Expanded the hint to Exercise 10 in Section 3.4
Typo:  Example 4.4, corrected "convert theta = 40" to "convert theta = 41" (Se. Tarpinian)
Typo:  Example 4.13, corrected "alpha = 0.775 rad" to "beta = 0.775 rad" (D. Billington)
Typo:  Appendix A, corrected the answers to Exercises 3 and 5 from Section 4.4 (S. Halas)


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2009-11-23:
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Typo:  Appendix A, corrected the answer to Exercise 5 from Section 4.2 (K. Kachin)


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2009-11-11:
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Typo:  Section 3.3, corrected the denominator in Exercise 6 (Sa. Tarpinian)


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2009-10-12:
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Typo:  Example 1.25, fixed the caption in Figure 1.4.8b
Typo:  Example 1.26, fixed a double word "plane plane" (M. Brey)


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2009-09-23:
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Typo:  Section 1.4, fixed a broken page reference in the exercises (M. Khoury)


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2009-08-29:
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Initial version 1.0 is released