Errata

This is the errata page for the Projective Geometric Algebra Illuminated. To find out which printing you have, look on the copyright page.

Second Printing

There are no known errata in the second printing. If you have found something, please email the author (lengyel@terathon.com).

First Printing

• Page 84. In Table 2.16, both bulk duals of $$\mathbf e_4$$ should be 0. The table should look like the one on the wiki page for duals.

• Page 156. The number of multiply-adds required for transforming a line with a motor did not include the work needed to calculate $$\mathbf a$$, $$\mathbf b$$, and $$\mathbf c$$. Each cross product adds 6 multiply-adds, so the correct total for transforming a line is 54.

• Page 156. Similarly, the number of multiply-adds required for transforming a plane with a motor did not include the work needed to calculate $$\mathbf a$$. The correct total for transforming a plane is 35.