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Formal normal forms for holomorphic maps tangent to the identity  [PDF]
Marco Abate,Francesca Tovena
Mathematics , 2004,
Abstract: We describe a procedure for constructing formal normal forms of holomorphic maps with a hypersurface of fixed points, and we apply it to obtain a complete list of formal normal forms for 2-dimensional holomorphic maps tangential to a curve of fixed points.
Holomorphic 2-forms on Complex Threefolds  [PDF]
Frederic Campana,Thomas Peternell
Mathematics , 1998,
Abstract: We study holomorphic 2-forms on projective (or compact Kaehler) threefolds not of general type and prove that in almost all cases the 2-form is created by some standard process. This means roughly that every 2-form is induced by a meromorphic map to a surface, a torus or a symplectic manifold. If the 2-form has only finitely many zeroes, more precise results hold. Finally we prove that compact Kaehler threefolds with negative Kodaira dimension are uniruled unles they are simple, i.e. there is no positive dimensional compact subvariety through the general point of the manifold (these simple threefolds are expected not to exist). This generalises the fundamental result of Miyaoka and Mori to the Kaehler (non-simple) case.
Holomorphic forms, the $\bar{\partial}$-equation, and duality on a reduced complex space  [PDF]
H?kan Samuelsson Kalm
Mathematics , 2015,
Abstract: We study two natural notions of holomorphic forms on a reduced pure $n$-dimensional complex space $X$: sections of the sheaves $\mathit{\Omega}_X^{\bullet}$ of germs of holomorphic forms on $X_{reg}$ that have a holomorphic extension to some ambient complex manifold, and sections of the sheaves $\omega_X^{\bullet}$ introduced by Barlet. We show that $\mathit{\Omega}_X^p$ and $\omega_X^{n-p}$ are Serre dual to each other in a certain sense. We also provide explicit, intrinsic and semi-global Koppelman formulas for the $\bar{\partial}$-equation on $X$ and introduce fine sheaves $\mathscr{A}_X^{p,q}$ and $\mathscr{B}_X^{p,q}$ of $(p,q)$-currents on $X$, that are smooth on $X_{reg}$, such that $(\mathscr{A}_X^{p,\bullet},\bar{\partial})$ is a resolution of $\mathit{\Omega}_X^p$ and, if $\mathit{\Omega}_X^{n-p}$ is Cohen-Macaulay, $(\mathscr{B}_X^{p,\bullet},\bar{\partial})$ is a resolution of $\omega_X^{p}$.
Holomorphic Motions and Related Topics  [PDF]
Frederick Gardiner,Yunping Jiang,Zhe Wang
Mathematics , 2008,
Abstract: In this article we give an expository account of the holomorphic motion theorem based on work of M\`a\~n\'e-Sad-Sullivan, Bers-Royden, and Chirka. After proving this theorem, we show that tangent vectors to holomorphic motions have $|\epsilon \log \epsilon|$ moduli of continuity and then show how this type of continuity for tangent vectors can be combined with Schwarz's lemma and integration over the holomorphic variable to produce H\"older continuity on the mappings. We also prove, by using holomorphic motions, that Kobayashi's and Teichm\"uller's metrics on the Teichm\"uller space of a Riemann surface coincide. Finally, we present an application of holomorphic motions to complex dynamics, that is, we prove the Fatou linearization theorem for parabolic germs by involving holomorphic motions.
Normal forms for singularities of one dimensional holomorphic vector fields
Antonio Garijo,Armengol Gasull,Xavier Jarque
Electronic Journal of Differential Equations , 2004,
Abstract: : We study the normal form of the ordinary differential equation $dot z=f(z)$, $zinmathbb{C}$, in a neighbourhood of a point $pinmathbb{C}$, where $f$ is a one-dimensional holomorphic function in a punctured neighbourhood of $p$. Our results include all cases except when $p$ is an essential singularity. We treat all the other situations, namely when $p$ is a regular point, a pole or a zero of order $n$. Our approach is based on a formula that uses the flow associated with the differential equation to search for the change of variables that gives the normal form.
Normal forms and linearization of holomorphic dilation type semigroups in several variables  [PDF]
Filippo Bracci,Mark Elin,David Shoikhet
Mathematics , 2008,
Abstract: In this paper we study commuting families of holomorphic mappings in $\mathbb{C}^n$ which form abelian semigroups with respect to their real parameter. Linearization models for holomorphic mappings are been used in the spirit of Schr\"oder's classical functional equation.
Large Harnack inequalities, Kobayashi distances and holomorphic motions  [PDF]
E. M. Chirka
Mathematics , 2012,
Abstract: We prove some generalizations and analogies of Harnack inequalities for pluriharmonic, holomorphic and "almost holomorphic" functions. The results are applied to the proving of smoothness properties of holomorphic motions over almost complex manifolds.
$L^2$-sheaves of holomorphic functions and $n$-forms on complex spaces with isolated singularities  [PDF]
Jean Ruppenthal
Mathematics , 2015,
Abstract: Let $X$ be a Hermitian complex space of pure dimension $n$ with isolated singularities. In the present paper, we give a natural resolution for the canonical sheaf of square-integrable holomorphic $n$-forms with Dirichlet boundary condition on $X$. As application, we obtain an explicit smooth model for the $L^2$-$\bar{\partial}$-cohomology, including natural resolutions for sheaves of $\bar{\partial}$-closed (holomorphic) $L^2$-functions.
Analytic normal forms for convergent saddle-node vector fields  [PDF]
Reinhard Sch?fke,Lo?c Jean Dit Teyssier
Mathematics , 2013,
Abstract: We give unique analytic "normal forms" for germs of a holomorphic vector field of the complex plane in the neighborhood of an isolated singularity of saddle-node type having a convergent formal separatrix. We specifically address the problem of computing the normal form explicitly.
Normal forms and complex periodic orbits in semiclassical expansions of Hamiltonian systems  [PDF]
P. Leboeuf,A. Mouchet
Physics , 1998, DOI: 10.1006/aphy.1999.5916
Abstract: Bifurcations of periodic orbits as an external parameter is varied are a characteristic feature of generic Hamiltonian systems. Meyer's classification of normal forms provides a powerful tool to understand the structure of phase space dynamics in their neighborhood. We provide a pedestrian presentation of this classical theory and extend it by including systematically the periodic orbits lying in the complex plane on each side of the bifurcation. This allows for a more coherent and unified treatment of contributions of periodic orbits in semiclassical expansions. The contribution of complex fixed points is find to be exponentially small only for a particular type of bifurcation (the extremal one). In all other cases complex orbits give rise to corrections in powers of $\hbar$ and, unlike the former one, their contribution is hidden in the ``shadow'' of a real periodic orbit.
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