27 November 2013
Diluted EPS refers to adjusting of EPS to convertible instruments such as warrant, convertible debt etc. so where any instrument is issued which can be converted to equity, they will have a potential dilutive effect on EPS.
So Buyback would lead to concentration of EPS. however fresh issue or bonus shares will have dilute impact as they lead to larger denominator. I believe you should covered it in AS - 20.