In this page of Vol.4
http://www.allaboutcircuits.com/vol_4/chpt_8/5.html

the rows of the truth table are described with the variables α,β,χ and δ. I 'd like to point out that the first four Greek alphabet letters are α,β,γ and δ.
It's like writing a,b,x,d. It's not wrong, but it spoils the continuum.

P.S. Usually we write the small letter gamma like so (sorry for the big image):

 

Sounds reasonable. I did think Greek went alpha, beta, gamma.....

 

I 've always wondered how you make those corrections in the e-book. Do you edit the page on the fly, or re-compiler the whole html from its source code? What if I want to make a correction to my submissions (when they FINALLY become part of the AAC site, apart from the e-book at ibiblio)?