/prog/rammer here, need urgent help

hello /sci/, long time no see
There is currently a troll on /prog/, and would greatly appreciate your help.

Basically, the troll is trying to prove that 0.999~ =/= 1
Here are some of his arguments
http://stormtower.invisionplus.net/?mforum=stormtower&showtopic=97

I'm wondering if the maths genius' on this board can rip him apart? Thank you

NERRRRRRRRRD WARRRRRRRRRRRR! XD

Mathematicians: Discover fundamental facts about the "world" which will be as true in 500 years as they are right now.  The work of Gauss or Jacobi or Abel in the first half of the 19th century are still relevant to work being done today.  How many physicists from that time can you say that about?  Even the mathematicians whose work isn't terribly important has created something truly permanent for the world to remember him by, which is far more than just about anyone else in the world can say.

Programmers: Spend days in a dark room with one hand stuffed in a bag of doritos and one hand on their keyboard, coding greasemonkey scripts that make it slightly more efficient to surf their favorite discussion board and waste even more hours of their lives.  Their work does not create fundamental human truth, it makes pixels on a monitor flicker in a certain pattern.  Their work will be obsolete when the next version of Windows comes out.

I've been both a programmer (professional for 5 years) and a mathematician (currently grad student).  Programming requires skill and a logical, organized mind, but in the end, no significant intelligence or creativity.

Also, this: http://www.xkcd.com/435/