Problem: Prove the following,
if b,d 0
I'm sorry to say I analyze this utterly elementary proof to the point of being unable to move.
Proof from book:
by (iii) =
the book then cites the following proof as justification for the latter equivalence:
(iii) = if a,b \not= 0
proof of (iii) from book,
I get that
I also understand that
There is a continuity gap in my comprehension, educate me please.