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**Extra info for Communications in Mathematical Physics - Volume 254**

**Example text**

We denote the space of smooth connections by A(X) := 1 (X; g). Associated to a connection A ∈ A(X) one has the exterior derivative dA on g-valued differential forms given by dA η = dη + [A ∧ η] ∀η ∈ k (X; g). Here the Lie bracket indicates how the values of the differential forms are paired. Now dA ◦ dA does not necessarily vanish, but it is a zeroeth order operator, dA dA η = [FA ∧ η] given by the curvature FA = dA + 21 [A ∧ A] ∈ 2 (X; g). So dA ◦ dA = 0 if and only if the connection is flat, that is its curvature vanishes.

Kamada where a, q0 , r0 ∈ R, b, c, q, r ∈ R3 and D is a 3 × 3-matrix and x ∈ S13 . Then, from (28), we have cosh2 (ρ◦ϕ) = 1 + a sinh ρ + cosh ρ b∗ v + q0 r0 sinh ρ + cosh ρ r ∗ v + s 2 . (31) Comparing (27) with (30), and using (31), we obtain a sinh ρ + cosh ρ b∗ v + q0 r0 sinh ρ + cosh ρ r ∗ v + s 1+ 2 = cosh2 ρ . |k(r0 sinh ρ + cosh ρ r ∗ v + s)| (32) As ρ → ±∞, we can see that r = 0. Indeed, unless r = 0, the limit of the left-hand side is finite for some v ∈ S 2 , but that of the right is always infinite.

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