Apple Magazine (27 April 2012)

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AppleMagazine is a weekly booklet jam-packed with information, iTunes and Apps stories, interviews and unique articles on whatever and every thing Apple. Apple journal brings a brand new suggestion of sunshine, clever, leading edge examining for your fingertips; with a world view of Apple and its effect on our lives - be it relaxation actions, kin or work-collaborative initiatives. Elegantly designed and hugely interactive, Apple journal also will hold you up-to-date at the most modern weekly information. It's that easy! It’s all approximately Apple and its around the globe tradition impression, multi function position, and just one faucet away.

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By differentiating, one finds xi1 xi2 . . xi λ ∂ ∂ ∂ ··· Z(b, λ) ∂bi1 ∂bi2 ∂bi = Z −1 (λ) . 32) b=0 We now introduce the function W(b, λ) = ln Z(b, λ). 33) In a probabilistic interpretation, W(b, λ) is the generating function of the cumulants of the distribution. 28), the perturbative expansion of cumulants is much simpler since it contains only connected contributions. 26) are contained in W(0, λ). Finally note that, in the Gaussian case, W(b) reduces to a form quadratic in b. Remark. i = , b=0 are called connected -point correlation functions.

The divergence of the series can easily be understood: if one changes the sign of λ in the integral, the maximum of the integrand becomes a minimum and the selected saddle point can no longer give the leading contribution to the integral. (ii) Often integrals have the more general form dx ρ(x) e−S(x)/λ . I(λ) = Then, provided ln ρ(x) is analytic at the saddle point, it is not necessary to take the factor ρ(x) into account in the saddle point equation. Indeed, this factor would induce a shift of order x − xc to the saddle point position, a solution of S (xc )(x − xc ) ∼ λρ (xc )/ρ(xc ), and, thus, √ of order λ while the contribution to the integral comes from a region of order λ, which is much larger than the shift.

Solution. One sets S(t) = 12 (t + 1/t) . The saddle point tc is given by S (tc ) = 12 (1 − 1/t2c ) = 0 ⇒ tc = 1 . Then, S (tc ) = 1/t3c = 1 . One concludes Kν (z) ∼ (π/2z)1/2 e−z . 7 Evaluate by the steepest descent method the integral 1 2π In (s) = +π/2 dθ (cos θ)n einθ tanh s −π/2 as a function of the real parameter s in the limit n → ∞. One will verify that the function is real. Solution. One introduces the function S(θ) = −iθ tanh s − ln cos θ . The function is analytic except at the points θ = π/2 mod (π).

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