Results 31 to 40 of about 36,931 (242)

Strategies Toward Accessing Enantioenriched (Hetero)Benzo‐Fused 5‐ and 6‐ Membered Rings via Intermolecular Carbometalation

Angewandte Chemie, EarlyView.
The use of transition‐metal catalysts and design of chiral ligands have allowed chemists to access highly functionalized benzofused 5‐ and 6‐ membered rings in high yield and enantioselectivity. A common strategy used relies on an intermolecular carbometalation across alkynes and olefins, usually followed by a subsequent intramolecular carbometalation.
Clara Jans, Armaan Grewal, Xavier Abel‐Snape, Mark Lautens   +3 more
wiley   +2 more sources

Équation de Pell–Abel et applications

Comptes Rendus. Mathématique, 2022
In this paper, we show that there are solutions of degree $r$ of the equation of Pell–Abel on some real hyperelliptic curve of genus $g$ if and only if $ r > g$.
Gendron, Quentin
doaj   +1 more source

Exact solution of the Susceptible–Exposed–Infectious–Recovered–Deceased (SEIRD) epidemic model

Electronic Journal of Qualitative Theory of Differential Equations
An exact solution of an initial value problem for the Susceptible–Exposed–Infectious–Recovered–Deceased (SEIRD) epidemic model is derived, and various properties of the exact solution are obtained.
Norio Yoshida
doaj   +1 more source

Dynamic Keynesian Model of Economic Growth with Memory and Lag

Mathematics, 2019
A mathematical model of economic growth with fading memory and continuous distribution of delay time is suggested. This model can be considered as a generalization of the standard Keynesian macroeconomic model.
Vasily E. Tarasov, Valentina V. Tarasova   +1 more
doaj   +1 more source

Multidimensional integrable vacuum cosmology with two curvatures [PDF]

, 1996
The vacuum cosmological model on the manifold $R \times M_1 \times \ldots \times M_n$ describing the evolution of $n$ Einstein spaces of non-zero curvatures is considered. For $n = 2$ the Einstein equations are reduced to the Abel (ordinary differential)
Belinsky V A, Berezin V A, Bleyer U, Bleyer U, Demiansky M, Forgacs P, Gleiser M, Ivashchuk V D, Ivashchuk V D, Ivashchuk V D, Ivashchuk V D, Ivashchuk V D, Ivashchuk V D, Ivashchuk V D, Ivashchuk V D, Ivashchuk V D, Koikawa T, Lorenz-Petzold D, Melnikov V N, Melnikov V N, Milne E A, Polyanin A D, Szydlowski M, Szydlowski M, Toda M, V D Ivashchuk, V N Melnikov, V R Gavrilov, Wesson P S, Zaitsev V F   +29 more
core   +3 more sources

U(1)-invariant membranes: the geometric formulation, Abel and pendulum differential equations

, 2010
The geometric approach to study the dynamics of U(1)-invariant membranes is developed. The approach reveals an important role of the Abel nonlinear differential equation of the first type with variable coefficients depending on time and one of the ...
A. A. Zheltukhin, Desgupta A., Desgupta A., Duff M. J., Eisenhart L. P., M. Trzetrzelewski, Saaty T. L., Semenov-Tian-Shanskii M. A., Townsend P. K., Zheltukhin A. A., Zheltukhin A. A., Zheltukhin A. A.   +11 more
core   +1 more source

Anisotropic geodesic fluid in non-comoving spherical coordinates

, 2017
We start with a recently introduced spherically symmetric geodesic fluid model (arXiv: 1601.07030) whose energy-momentum tensor in the comoving frame is dust-like with nontrivial energy flux.
Stichel, Peter C.
core   +1 more source

Lie families: theory and applications [PDF]

, 2010
We analyze families of non-autonomous systems of first-order ordinary differential equations admitting a common time-dependent superposition rule, i.e., a time-dependent map expressing any solution of each of these systems in terms of a generic set of ...
Boyko V M, Cariñena J F, Cariñena J F, Cariñena J F, Cariñena J F, Chandrasekar V K, Chiellini A, Guldberg A, Haas F, Ibragimov N H, Janusz Grabowski, Javier de Lucas, John F, José F Cariñena, Lie S, Redheffer R, Srokowski T, Trzetrzelewski M Zheltukhin1 A A, Vessiot E, Vessiot E   +19 more
core   +1 more source

Solutions of the Perturbed KDV Equation for Convecting Fluids by Factorizations

, 2009
In this paper, we obtain some new explicit travelling wave solutions of the perturbed KdV equation through recent factorization techniques that can be performed when the coefficients of the equation fulfill a certain condition. The solutions are obtained
Cornejo-Perez, O., Rosu, H. C.
core   +1 more source

Abel-like differential equations with a unique limit cycle [PDF]

Nonlinear Analysis: Theory, Methods & Applications, 2011
Agraïments: M.J.A. was partially supported by grants MTM2005-06098-C02-1. J.L.B. and M.F. were partially supported by grant FEDER(UE) MTM2008-05460.
Álvarez Torres, María Jesús, Bravo, Jose Luis, Fernández, Manuel   +2 more
openaire   +5 more sources