By Y. Barkatou, S. Berhanu, A. Meziani, R. Meziani, N. Mir

This quantity comprises the court cases of the Workshop on Geometric research of numerous complicated Variables and comparable themes, which was once held from may possibly 10-14, 2010, in Marrakesh, Morocco. The articles during this quantity current present learn and destiny traits within the thought of a number of complicated variables and PDE. Of word are survey articles, the 1st providing fresh effects at the solvability of complicated vector fields with serious issues whereas the second one matters the Lie team constitution of the automorphism teams of CR manifolds. the opposite articles characteristic unique learn in significant subject matters of research facing analytic and Gevrey regularity, life of distributional lines, the $\bar\partial$-Neumann operator, automorphisms of hypersurfaces, holomorphic vector bundles, areas of harmonic varieties, and Gysin sequences

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**Additional resources for Geometric Analysis of Several Complex Variables and Related Topics: Marrakesh Workshop May 10-14, 2010, Marrakesh, Morocco**

**Example text**

B) If m = 1, and ψ(0) > 0, φ has a unique negative minima at 0 and s1 ( ) < 0 < s2 ( ) We will show that conﬁguration A+ B − B − A+ is suitable. 9) and the two other zeroes of φ s˜1 and s˜2 , correspond to points of negative local minima. We will show that conﬁguration A+ B − C − C − B − A+ is suitable. (c) If m = 2, then φ has a unique negative minimum at s0 ( ) and a negative inﬂexion point at 0. Depending on the sign of s0 ( ), we are either in the situation when −σ < s1 < s0 < 0 < s2 < σ , or −σ < s1 < 0 < s0 < s2 < σ .

Using our general considerations, we have just to verify that S1 is of type A− , S2 of type C − , S3 of type B − and S4 of type A+ . For short, we note A− B + C + A+ . Let us verify these assertions. 11). 17). The sign − of σ for S2 , which is the same as for S3 permits to escape from D. We now treat the three other cases which are actually simpler or analogous. Case (ii)-a. We have four sectors. In sector S1 , we consider ingoing rays parallel to (−σ). In sectors S2 and S3 , we consider outgoing rays parallel to (σ) for σ > 0.

Because all 40 26 MAKHLOUF DERRIDJ AND BERNARD HELFFER these angles are not zero and can be controlled by -independent lower bounds and upper bounds. It is clear that we get a uniform positive lower bound for det(Dγ). 15)). Let us illustrate what we explained there on an example, let us assume that we start from a point (s, t) in S1 such that the corresponding ray is broken when crossing (s0 ) and (s2 ). Then, we have • det(Dγ)(t, s, τ ) = 1 , if γ(t, s, τ ) ∈ S1 , • |det(Dγ)(t, s, τ )| = |Δ((−σ), (s0 ))|−1 |Δ((s0 ), (σ))| , if γ(t, s, τ ) ∈ S2 ∪ S3 , • |det(Dγ)(t, s, τ )| = |Δ((−σ), (s0 ))|−1 |Δ((s0 ), (σ))| |Δ((σ), (s2 ))|−1 |Δ((s2 )(σ))| , if γ(t, s, τ ) ∈ S4 .