ANSWERS: 3
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from the excellent wikipedia article; "In mathematics, "infinity" is often used in contexts where it is treated as if it were a number (i.e., it counts or measures things: "an infinite number of terms") but it is a different type of "number" than the real numbers." For the rest of this explanation see: http://en.wikipedia.org/wiki/Infinity See also this search list for many more great sources: http://www.google.com/search?hl=en&suggon=0&q=infinity+as+a+numerical+placeholder&btnG=Search
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Infinity is a philosophical concept, I believe, and mathematicians just borrow the terms when their numbers get too long. :-D
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I would say that infinity is a process rather than a number. I shares more of the properies of a verb than a noun, of going on for ever.
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