98 research outputs found
On principal minors of Bezout matrix
Let be real numbers, , and
be a polynomial of degree less than or equal to . Denote by the
matrix of generalized divided differences of with nodes
and by the Bezout matrix (Bezoutiant) of and . A relationship
between the corresponding principal minors, counted from the right-hand lower
corner, of the matrices and is established. It implies
that if the principal minors of the matrix of divided differences of a function
are positive or have alternating signs then the roots of the Newton's
interpolation polynomial of are real and separated by the nodes of
interpolation.Comment: 15 page
Dynamical systems method for solving operator equations
Consider an operator equation in a real Hilbert space.
The problem of solving this equation is ill-posed if the operator is
not boundedly invertible, and well-posed otherwise.
A general method, dynamical systems method (DSM) for solving linear and
nonlinear ill-posed problems in a Hilbert space is presented.
This method consists of the construction of a nonlinear dynamical system,
that is, a Cauchy problem, which has the following properties:
1) it has a global solution,
2) this solution tends to a limit as time tends to infinity,
3) the limit solves the original linear or non-linear problem. New
convergence and discretization theorems are obtained. Examples of the
applications of this approach are given. The method works for a wide range of
well-posed problems as well.Comment: 21p
Example of two different potentials which have practically the same fixed-energy phase shifts
It is shown that the Newton-Sabatier procedure for inverting the fixed-energy
phase shifts for a potential is not an inversion method but a parameter-fitting
procedure. Theoretically there is no guarantee that this procedure is
applicable to the given set of the phase shifts, if it is applicable, there is
no guaran- tee that the potential it produces generates the phase shifts from
which it was reconstructed. Moreover, no generic potential, specifically, no
potential which is not analytic in a neighborhood of the positive real semiaxis
can be reconstructed by the Newton-Sabatier procedure.
A numerical method is given for finding spherically symmetric compactly
supported potentials which produce practically the same set of fixed-energy
phase shifts for all values of angular momentum. Concrete example of such
potentials is given
Generalization of a theorem of Gonchar
Let be two complex manifolds, let be two
nonempty open sets, let (resp. ) be an open subset of
(resp. ), and let be the 2-fold cross
Under a geometric condition on the boundary sets and we show that
every function locally bounded, separately continuous on continuous on
and separately holomorphic on
"extends" to a function continuous on a "domain of holomorphy" and
holomorphic on the interior of Comment: 14 pages, to appear in Arkiv for Matemati
Mathematical Modeling of Boson-Fermion Stars in the Generalized Scalar-Tensor Theories of Gravity
A model of static boson-fermion star with spherical symmetry based on the
scalar-tensor theory of gravity with massive dilaton field is investigated
numerically.
Since the radius of star is \textit{a priori} an unknown quantity, the
corresponding boundary value problem (BVP) is treated as a nonlinear spectral
problem with a free internal boundary. The Continuous Analogue of Newton Method
(CANM) for solving this problem is applied.
Information about basic geometric functions and the functions describing the
matter fields, which build the star is obtained. In a physical point of view
the main result is that the structure and properties of the star in presence of
massive dilaton field depend essentially both of its fermionic and bosonic
components.Comment: 16 pages, amstex, 5 figures, changed conten
Structure of W3(OH) from Very High Spectral Resolution Observations of 5 Centimeter OH Masers
Recent studies of methanol and ground-state OH masers at very high spectral
resolution have shed new light on small-scale maser processes. The nearby
source W3(OH), which contains numerous bright masers in several different
transitions, provides an excellent laboratory for high spectral resolution
techniques. We present a model of W3(OH) based on EVN observations of the
rotationally-excited 6030 and 6035 MHz OH masers taken at 0.024 km/s spectral
resolution. The 6.0 GHz masers are becoming brighter with time and show
evidence for tangential proper motions. We confirm the existence of a region of
magnetic field oriented toward the observer to the southeast and find another
such region to the northeast in W3(OH), near the champagne flow. The 6.0 GHz
masers trace the inner edge of a counterclockwise rotating torus feature.
Masers at 6030 MHz are usually a factor of a few weaker than at 6035 MHz but
trace the same material. Velocity gradients of nearby Zeeman components are
much more closely correlated than in the ground state, likely due to the
smaller spatial separation between Zeeman components. Hydroxyl maser peaks at
very long baseline interferometric resolution appear to have structure on
scales both smaller than that resolvable as well as on larger scales.Comment: 21 pages using emulateapj.cls including 16 figures and 2 tables,
accepted to Ap
Semantic and Syntaxic Features of the Opposition Design and Ways of Its Expression in a Legal Article
The work is devoted to the analysis of the semantic and syntactic features of the construction of opposition, as one of the most common figures of contrast. This technique is considered in a legal article to identify the functions performed by opposition in terms of semantics and syntax. Specific examples of the use of oppositions are given and analyzed, and it is concluded that the antithesis in a legal article to a lesser extent performs an aesthetic, expressive function, but provides subject-logical content, acting as a request, suggestion or persuasion.Π Π°Π±ΠΎΡΠ° ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° Π°Π½Π°Π»ΠΈΠ·Ρ ΡΠ΅ΠΌΠ°Π½ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ ΡΠΈΠ½ΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ ΠΏΡΠΎΡΠΈΠ²ΠΎΠΏΠΎΡΡΠ°Π²Π»Π΅Π½ΠΈΡ, ΠΊΠ°ΠΊ ΠΎΠ΄Π½ΠΎΠΉ ΠΈΠ· ΡΠ°ΠΌΡΡ
ΡΠ°ΡΠΏΡΠΎΡΡΡΠ°Π½Π΅Π½Π½ΡΡ
ΡΠΈΠ³ΡΡ ΠΊΠΎΠ½ΡΡΠ°ΡΡΠ°. ΠΠ°Π½Π½ΡΠΉ ΠΏΡΠΈΡΠΌ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ Π² ΡΡΠ°ΡΡΠ΅ ΡΡΠΈΠ΄ΠΈΡΠ΅ΡΠΊΠΎΠΉ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΠΎΡΡΠΈ Π΄Π»Ρ Π²ΡΡΠ²Π»Π΅Π½ΠΈΡ ΡΡΠ½ΠΊΡΠΈΠΉ, Π²ΡΠΏΠΎΠ»Π½ΡΠ΅ΠΌΡΡ
ΠΏΡΠΎΡΠΈΠ²ΠΎΠΏΠΎΡΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ΠΌ Ρ ΡΠΎΡΠΊΠΈ Π·ΡΠ΅Π½ΠΈΡ ΡΠ΅ΠΌΠ°Π½ΡΠΈΠΊΠΈ ΠΈ ΡΠΈΠ½ΡΠ°ΠΊΡΠΈΡΠ°. ΠΡΠΈΠ²ΠΎΠ΄ΡΡΡΡ ΠΈ Π°Π½Π°Π»ΠΈΠ·ΠΈΡΡΡΡΡΡ ΠΊΠΎΠ½ΠΊΡΠ΅ΡΠ½ΡΠ΅ ΠΏΡΠΈΠΌΠ΅ΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠΎΡΠΈΠ²ΠΎΠΏΠΎΡΡΠ°Π²Π»Π΅Π½ΠΈΠΉ ΠΈ Π΄Π΅Π»Π°Π΅ΡΡΡ Π²ΡΠ²ΠΎΠ΄ ΠΎ ΡΠΎΠΌ, ΡΡΠΎ Π°Π½ΡΠΈΡΠ΅Π·Π° Π² ΡΡΠ°ΡΡΠ΅ ΡΡΠΈΠ΄ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅ΠΌΠ°ΡΠΈΠΊΠΈ Π² ΠΌΠ΅Π½ΡΡΠ΅ΠΉ ΡΡΠ΅ΠΏΠ΅Π½ΠΈ Π²ΡΠΏΠΎΠ»Π½ΡΠ΅Ρ ΡΡΡΠ΅ΡΠΈΡΠ΅ΡΠΊΡΡ, ΡΠΊΡΠΏΡΠ΅ΡΡΠΈΠ²Π½ΡΡ ΡΡΠ½ΠΊΡΠΈΠΈ, Π° ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΠ²Π°Π΅Ρ ΠΏΡΠ΅Π΄ΠΌΠ΅ΡΠ½ΠΎ-Π»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅, Π²ΡΡΡΡΠΏΠ°Ρ Π² ΡΡΠ½ΠΊΡΠΈΠΈ ΠΏΡΠΎΡΡΠ±Ρ, ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½ΠΈΡ ΠΈΠ»ΠΈ ΡΠ±Π΅ΠΆΠ΄Π΅Π½ΠΈΡ
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