Permalink Submitted by Anonymous on March 22, 2013

In the first formula, after 1/9 , isn't better to write "- ..." instead of "+ ..."? I understand that, by writing "+ ...", the author may be denoting "+ -1/11", that is, "plus whatever comes next"; if that's the case, OK.

## Plus sign or minus sign?

In the first formula, after 1/9 , isn't better to write "- ..." instead of "+ ..."? I understand that, by writing "+ ...", the author may be denoting "+ -1/11", that is, "plus whatever comes next"; if that's the case, OK.