نتایج جستجو برای: central symmetric x
تعداد نتایج: 1139640 فیلتر نتایج به سال:
We consider optimization problems of the following type: min{tr(CX) : A(X) = B,X positive semidefinite}. Here, tr(·) denotes the trace operator, C and X are symmetric n× n matrices, B is a symmetric m ×m matrix and A(·) denotes a linear operator. Such problems are called semidefinite programs and have recently become the object of considerable interest due to important connections with max-min ...
Let X be an m-symmetric right process on Luzin space E and (E, F) be its associated quasi-regular Dirichlet form. Let µ be a signed smooth measure of X and A µ be the continuous additive functional (CAF in abbreviation) of X with signed Revuz measure µ. It defines a symmetric Feynman-Kac semigroup T t f (x) := E x [exp(A µ t)f (X t)] for t > 0 and f ≥ 0. (1) Define a symmetric quadratic form (E...
Suitable complexification of the well known hyperbolic Rosen Morse oscillator in one dimension is shown to give the fourth (and last?) exactly solvable model which combines the shape and PT invariance. PACS 03.65.Ge, 03.65.Fd Review paper [1] emphasizes that a requirement of the so called shape invariance (with respect to the translation of a parameter) determines all the four known exactly sol...
Suppose D is a bounded C domain in R and GD is the Green function of the killed symmetric α-stable process in D. In this note we establish a sharp upper bound estimate for GD in such a way that the explicit dependence of the constant in the estimate on α is also given. This sharp estimate allows us to recover the sharp upper bound estimate for the Green function of killed Brownian motion in D b...
Sakyo , Kyoto 606 - 8501 , Japan Group Symmetry in Interior - Point Methods for Semidefinite Program
A class of group symmetric Semi-Definite Program (SDP) is introduced by using the framework of group representation theory. It is proved that the central path and several search directions of primal-dual interior-point methods are group symmetric. Preservation of group symmetry along the search direction theoretically guarantees that the numerically obtained optimal solution is group symmetric....
A streamlined synthesis of extended thiophloroglucinol ligands and their trinuclear NiII3 complexes.
A protocol for the synthesis of trinucleating C3-symmetric ligands based on a central meta-phenylene bridging 1,3,5-trimercaptobenzene (thiophloroglucinol) backbone has been established. The key compound turned out to be the trialdehyde obtained from the triple nucleophilic attack of dimethyldithiocarbamate at 1,3,5-tribromo-2,4,6-triformylbenzene. Reacting this trialdehyde with six equivalents...
We establish a series of properties of symmetric, N -pulse, homoclinic solutions of the reduced Gray– Scott system: u′′ = uv2, v′′ = v− uv2, which play a pivotal role in questions concerning the existence and self-replication of pulse solutions of the full Gray–Scott model. Specifically, we establish the existence, and study properties, of solution branches in the (α,β)-plane that represent mul...
Chandra images show symmetric, 8 kpc long, arm-like features in the X-ray halo surrounding NGC 4636. The leading edges of these features are sharp and are accompanied by temperature increases of ∼ 30%. These properties, along with their scale and symmetry, suggest that the arm-like structures are produced by nuclear outburst driven shocks. We interpret these observations as part of a cycle in w...
The nuclear pore complex (NPC), embedded in the nuclear envelope, is a large, dynamic molecular assembly that facilitates exchange of macromolecules between the nucleus and the cytoplasm. The yeast NPC is an eightfold symmetric annular structure composed of ~456 polypeptide chains contributed by ~30 distinct proteins termed nucleoporins. Nup116, identified only in fungi, plays a central role in...
Skew-symmetric families of distributions are perturbed distributions about a central symmetric distribution, the kernel. Another distribution, the skewing distribution, is used to generate perturbations of the kernel which produces a family of distributions with the kernel as a central member of the family. In this note, it is argued that the choice of skewing distribution does not have a major...
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