Hello. I take into consideration all errors made. I only point out those that I think are not understood: as the first pages say, this process is an educational one, underneath everything else. I sometimes have more posts detailing the errors because the authors wrote in a style that allowed a great host of different mistakes that don't repeat.
With regards to the math, there's no problem. After reading the first pages, you should understand why the math is correct.
22-Jan-2010 05:16:13