Transcribers Note

On Page 162 the equation :

∴ Z + x´X´ + μ´W = ɑwW
Z = (ɑw - μ´)W - x´X´

is printed as:

∴ Z + x₁X´ + μ´W = ɑwW
Z = (ɑw - μ´)W - x´X´