Chapter 3, spelling/typos

[smh69]

While explaining closure, the line: "(a+b-n)G=aG+bG-nG=aG+bG-O=aG+bG" appears to have a capital-oh: Is that meant to be? what does O stand for, order? or should that be zero 0 for point at infinity?

While explaining commutativity and associativity in Ch03, the asciidoc uses P, Q, and R while the images in figure 8 and 9 switch to using symbols A, B, and C. (fixed in commit bf91399)

Under 'Defining the curve for Bitcoin':

• the second bullet-point mis-spells 'finite' with a missing 'i'.
• the sentence: "The curve was chosen, in part, because n is so close to P." uses a capital-P while 'p' for prime is printed in lowercase elsewhere.

In the side note for 'Why Double-sha256?', the last phrase has an additional 'is' and the word 'possible' seems redundant preceding the word 'potential'.

[jimmysong]

fixed, thanks!