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Alpha Beta Delta Gamma Theta Mu Pi Sigma/ Stigma * * * * * stigma is not a letter! But here are some more: chi - the chi-square test in statistics, epsilon - to represent diminishingly small quantities in calculus, phi - symbol for golden ratio lambda - parameter (mean) for the Poisson distribution, rho - radius zeta - Riemann zeta function
In English we use Latin based alphabet consisting of 26 letters: a b c d e f g h i j k l m n o p q r s t u v w x y z The Greek alphabet consists of 32 letters: alpha, beta, gamma, delta, epsilon, digamma, stigma, zeta, heta, eta, theta, iota, yot, kappa, lamda, mu, nu, xi, omicron, pi, san, koppa, rho, sigma, tau, upsilon, phi, chi, psi, omega, sampi, sho and descended from the Phoenician abjad in the 8th or 9th century BC. Source: list of all symbols tagged *GREEK*LETTER* in allkeys.txt on Unicode website
A zeta function is the function of the complex variable s which analytically continues the sum of the series 1/n^3 for all values from n=1 to infinity, which converges when the real part of s is greater than 1.
Alpha = 1 (1000) Beta = 2 (2000) Gamma = 3 (3000) Delta = 4 (4000) Epsilon = 5 (5000) Digamma = 6 (6000) Zeta = 7 (7000) Eta = 8 (8000) Theta = 9 (9000) Iota = 10 Kappa = 20 Lambda = 30 Mu = 40 Nu = 50 Xi = 60 Omicron = 70 Pi = 80 Qoppa = 90 Rho = 100 Sigma = 200 Tau = 300 Upsilon = 400 Phi = 500 Chi = 600 Psi = 700 Omega = 800 Sampi = 900 So, 2013 should be Beta (2000) Iota (10) Gamma (3) 2000+10+3=2013 That means it is "big"
It is not so much an equation, as a function. Since the definition is fairly complicated, I suggest you visit the Wikipedia page: http://en.wikipedia.org/wiki/Riemann_zeta_function ... or do additional Web searches either for "Riemann hypothesis" or "Riemann zeta function".