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Riemann Hypothesis zeta(s) = 1/1^{s} + 1/2^{s} + 1/3^{s} + ... (s = a + it) all 0's of zeta(s) in strip 0<=a<=1 lie on central line a=1/2 Twin Primes occur infinitely Twin primes are primes that are 2 integers apart. Examples include 5 & 7, 17 & 19, 101 & 103 Goldbach's Postulate Every even # > 2 can be expressed as the sum of 2 primes. Euclid's Parallel Postulate Through a point, not on a line, there exists exactly 1 line parallel to the given line. (Then there's those nonEuclidean people...) (k=1..) 1/k^{n} = ? Although others have found that this expression equals PI^{2} / 6 when n=2, PI^{4} / 90 when n = 4 and similar solutions for all possible even values of n, no one has discovered an exact value when n is an odd integer (3, 5, 7, ...) (note: when n=1, the sum does not converge, but it does has relations to the gamma constant). 


