"OK. So here is my question to be posted in TAJCD Vol.II:
on p. 87 you state:
Compare the triangle we started with, A~B~C, to the one we finished with, A'~B'~C'.
It is apparent immediately that they share the same measure of horizontal displacement, kō (勾) however the vertical displacement of A~B (殳) of the original triangle has effectively
stretched to become the measure A'~B' (玄).
I am not getting this...the stretched part. And why is this now labeled 'gen'?
My forehead is not yet burning and I will continue to study!
Would anyone like to tackle that one?