Most folks that know me know that my maths is not that great.....but, as per the thread title, it is not the R4 mistake in "Calculated Errors" section but the formula, the last one in the chain in that section......To me it's wrong:
http://www.r-type.org/articles/art-118.htm
?
Lawrence.
http://www.r-type.org/articles/art-118.htm
?
Lawrence.








