/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

>>16
>what are you contributing to the world right now
Absolutely nothing.  The math I do (elliptic curves/modular functions/etc..) has fuck all to do with anything in the real world, except possibly cryptography (but any cryptography based on prime numbers will be worthless once quantum computers are invented anyway).

What I AM doing, though, is contributing (in a tiny way so far) to the expansion of a field of knowledge that contains some of the deepest and most difficult truths discovered in the history of man.

>>16
>>17
obvious samefag

>>20
>Still reading SICP?
>SICP
>CP

:O