01536oam 2200397Ia 450 991069757890332120090625111849.0(CKB)5470000002389161(OCoLC)327631777(EXLCZ)99547000000238916120090520d2008 ua 0engurnn|||||||||txtrdacontentcrdamediacrrdacarrierAn assessment of the science and technology predictions in the Army's STAR21 report[electronic resource] /John Lyons, Richard Chait, and Jordan WillcoxWashington, DC :Center for Technology and National Security Policy, National Defense University,[2008]vi, 36 pages digital, PDF fileDefense & technology papers ;no. 50Title from PDF title page (viewed on May 20, 2009)."July 2008."Includes bibliographical references.Military researchForecastingEvaluationMilitary researchForecastingEvaluation.Lyons John W.1930-14028Chait Richard1937-1393694Willcox Jordan1412929National Defense University.Center for Technology and National Security Policy.AWCAWCGPOBOOK9910697578903321An assessment of the science and technology predictions in the Army's STAR21 report3508087UNINA03878nam 22007335 450 991100254830332120250508130240.03-031-87825-610.1007/978-3-031-87825-1(CKB)38753200700041(DE-He213)978-3-031-87825-1(MiAaPQ)EBC32093247(Au-PeEL)EBL32093247(EXLCZ)993875320070004120250508d2025 u| 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierAn Algebraic Approach to the Many-Electron Problem /by Jaroslav Zamastil, Tereza Uhlířová1st ed. 2025.Cham :Springer Nature Switzerland :Imprint: Springer,2025.1 online resource (VIII, 71 p.) SpringerBriefs in Physics,2191-54313-031-87824-8 3-031-87827-2 Chapter 1: Quantized electron field -- Chapter 2: Hartree-Fock approximation -- Chapter 3: Coupled cluster method -- Chapter 4: Further developments.This book presents an algebraic approach to the coupled cluster method for many-electron systems, pioneered by Josef Paldus. Using field methods along with an algebraic, rather than diagrammatic, approach facilitates a way of deriving the coupled cluster method which is readily understandable at the graduate level. The book begins with the notion of the quantized electron field and shows how the N-electron Hamiltonian can be expressed in its language. This is followed by introduction of the Fermi vacuum and derivation of the Hartree-Fock equations along with conditions for stability of their solutions. Following this groundwork, the book discusses a method of configuration interaction to account for dynamical correlations between electrons, pointing out the size-extensivity problem, and showing how this problem is solved with the coupled cluster approach. This is followed by derivation of the coupled cluster equations in spin-orbital form. Finally, the book explores practical aspects, showing how one may take advantage of permutational and spin symmetries, and how to solve coupled-cluster equations, illustrated by the Hubbard model of benzene, the simplest quasi-realistic model of electron correlation.SpringerBriefs in Physics,2191-5431Quantum theoryQuantum electrodynamicsMathematical physicsMaterials scienceData processingElectronic structureQuantum chemistryComputer programsSolid state physicsQuantum PhysicsQuantum Electrodynamics, Relativistic and Many-body CalculationsMathematical Methods in PhysicsElectronic Structure CalculationsElectronic DevicesQuantum theory.Quantum electrodynamics.Mathematical physics.Materials scienceData processing.Electronic structure.Quantum chemistryComputer programs.Solid state physics.Quantum Physics.Quantum Electrodynamics, Relativistic and Many-body Calculations.Mathematical Methods in Physics.Electronic Structure Calculations.Electronic Devices.530.12Zamastil Jaroslavauthttp://id.loc.gov/vocabulary/relators/aut823860Uhlířová Terezaauthttp://id.loc.gov/vocabulary/relators/autMiAaPQMiAaPQMiAaPQBOOK9911002548303321An Algebraic Approach to the Many-Electron Problem4384733UNINA