http://math.wikia.com/wiki/Proof:The_Decimal_0.999..._is_Equivalent_to_1 - 0 views
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qt_gray on 04 Mar 13This is a link to a wiki where people can prove that 0.9999999 is equivalent to 1. This qualifies as a wiki because anyone can edit the page (the earliest entry I found was from 2008.) I like this wiki because it shows many ways to prove the two values are equivalent. Some of the proofs are rather simple and can be understood by students in an beginning or intermediate algebra class. I would use this wiki in my teaching by asking students if they agree with the proofs and to come up with their own proofs for the values.