ELLIPTIC BERNOULLI q-SERIES AND BERNOULLI NUMBERS The well-known Bernoulli numbers B(n), n = 0, 1, 2, 3, 4.... are defined as follows: u / {e(u) -1} = B(0) + B(1).u/1! + B(2).u^2/2! + B(3). u^3/3! + B(4).u^4/4! + B(5).u^5/5! + B(6).u^6/6! + .... . It is known that B(0) = 1, B(1) = -1/2, B(2) = 1/6, B(3) = 0, B(4) = -1/30, B(5) = 0, B(6) = 1/42. We recall from an earlier blogpost the elliptic exponential function E(iu, τ) := cn (u, τ) + i sn(u, τ). It is clear that lim E(iu, τ) = e(iu) = cos u + i sin u as q approaches 0, where q:=e(iπτ) . Replacing u by -iu, we get the functions E(u, τ) and e(u) , where lim E(u, τ) = e(u) as q approaches 0. We refer to each of E(iu, τ) and E(u, τ) as the elliptic exponential function, since the context indicates which one is meant. We have lim u / {E(u, τ) - 1} = u / {e(u)-1} as q approaches 0. Therefore...
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