This comment also by 86 177 136 35 24 June 2012 Aha The extra factor in Krane s numerator is the i which the formula now in the article which cites Cetnar s paper places before the one product symbol So the two formulas are equivalent and the only question is which is the clearer presentation for this article I vote for the one now in the article since it shows the i explicitly And to sign your posts click on the four below 4 lines under the Save page button on the right