i suppose i'm last person to know about this, but .... i wrote this on an index card https://www.flickr.com/photos/thane/28755638457/in/dateposted-public/ then took a photo of it using an iphone app i just installed called photomath and got this (fragment of a) detailed solution in less than a second https://www.flickr.com/photos/thane/41835897350/in/dateposted-public/ don't ask me what this thing can do....i just heard about it just now. -- Thane Plambeck tplambeck@gmail.com http://counterwave.com/