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BiljanaSomborskifb07... ∙
A Rast & Gasser 1898 in excellent condition is roughly $1,000 US. Values drop sharply for lesser condition.
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See http://mathforum.org/library/drmath/view/52619.html for a proof of the irrationality of sqrt(3). The proof that sqrt(5) is irrational is identical (substituting 5 for 3 in the proof).