Mark Vishik was one of the prominent figures in the theory of partial differential equations. His ground-breaking contributions were instrumental in integrating the methods of functional analysis into this theory. In this book, friends and pupils of Mark Vishik remember his life and work. From his early years as a student to his connection with the Lwow school of Stephan Banach and to his later career as a respected teacher and mentor, Vishik's legacy is explored in detail. His research and pedagogical work influenced hundreds of undergraduate and graduate students, many of whom went on to become leading figures in their own right. The reader is introduced to a number of remarkable scientists whose lives intersected with Vishik's, including S. Banach, J. Schauder, I. N. Vekua, N. I. Muskhelishvili, L. A. Lyusternik, I. G. Petrovskii, S. L. Sobolev, I. M. Gelfand, M. G. Krein, A. N. Kolmogorov, N. I. Akhiezer, J. Leray, J.-L. Lions, L. Schwartz, L. Nirenberg, and others.

The focus of the present work is nonrelativistic and relativistic quantum mechanics with standard applications to the hydrogen atom. The author has aimed at presenting quantum mechanics in a comprehensive yet accessible for mathematicians and other non-physicists. The genesis of quantum mechanics, its applications to basic quantum phenomena, and detailed explanations of the corresponding mathematical methods are presented. The exposition is formalized (whenever possible) on the basis of the coupled Schroedinger, Dirac and Maxwell equations. Aimed at upper graduate and graduate students in mathematical and physical science studies.

ThisbookisintendedtogivethereaderanopportunitytomastersolvingPDEpr- lems. Ourmaingoalwastohaveaconcisetextthatwouldcovertheclassicaltools ofPDEtheorythatareusedintoday'sscienceandengineering, suchaschar- teristics, thewavepropagation, theFouriermethod, distributions, Sobolevspaces, fundamentalsolutions, andGreen'sfunctions. WhileintroductoryFouriermethod -basedPDEbooksdonotgiveanadequatedescriptionoftheseareas, themore advancedPDEbooksarequitetheoreticalandrequireahighlevelofmathematical backgroundfromareader. Thisbookwaswrittenspeci?callyto?llthisgap, sat- fyingthedemandofthewiderangeofenduserswhoneedtheknowledgeofhow tosolvethePDEproblemsandatthesametimearenotgoingtospecializeinthis areaofmathematics. Arguably, thisistheshortestPDEcourse, whichstretchesfar beyondcommon, Fouriermethod-basedPDEtexts. Forexample, Hab03], which isacommonthoroughtextbookonpartialdifferentialequations, teachesasimilar setoftoolswhilebeingabout?vetimeslonger. Thebookisproblem-oriented. Thetheoreticalpartisrigorousyetshort. So- timeswereferthereadertotextbooksthatgivewidercoverageofthetheory. Yet, - portanttheoreticaldetailsarepresentedwithcare, whilethehintsgivethereaderan opportunitytorestoretheargumentstothefullrigor. Manyexamplesfromphysics areintendedtokeepthebookintuitiveforthereaderandtoillustratetheapplied natureofthesubject. Thebookwillbeusefulforanyhigher-levelundergraduatecourseandforse- studyforbothgraduateandhigher-levelundergraduatestudents, andforanys- cialtyinsciences. ItsRussianversionhasbeenastandardproblem-solvingmanual atMoscowStateUniversitysince1988, andisalsousedbystudentsofSt. Pete- burgUniversityandNovosibirskUniversities. ItsSpanishversionisusedatMorelia UniversityinMexico, whiletheEnglishdrafthasalreadybeenusedinViennaU- versityandatTexasA&MUniversity. Forfurtherreadingwerecommend Str92], Eva98], and EKS99]. Mu]nchen, AlexanderKomech August2007 AndrewKomech v Acknowledgements The?rstauthorisindebtedtoMargaritaKorotkinaforthefortunatesuggestionto writethisbook, toA. F. Filippov, A. S. Kalashnikov, M. A. Shubin, T. D. Ventzel, andM. I. Vishikforcheckingthe?rstversionofthemanuscriptandfortheadvice. BothauthorsaregratefultoH. Spohn(TechnischeUniversita]t, Mu]nchen)andto E. Zeidler(Max-PlanckInstituteforMathematics, Leipzig)fortheirhospitalityand supportduringtheworkonthebook. BothauthorsweresupportedbyInstituteforInformationTransmissionProblems (RussianAcademyofSciences). The?rstauthorwassupportedbytheDepartment ofMechanicsandMathematicsofMoscowStateUniversity, bytheAlexandervon HumboldtResearchAward, FWFGrantP19138-N13, andtheGrantsofRFBR. The secondauthorwassupportedbyTexasA&MUniversityandbytheNationalScience FoundationunderGrantsDMS-0621257andDMS-0600863. vii Contents 1 Hyperbolicequations. Methodofcharacteristics. . . . . . . . . . . . . . . . . . . 1 1 Derivationofthed'Alembertequation. . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Thed'Alembertmethodforin?nitestring . . . . . . . . . . . . . . . . . . . . . . 7 3 Analysisofthed'Alembertformula. . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 Second-orderhyperbolicequationsintheplane . . . . . . . . . . . . . . . . . 19 5 Semi-in?nitestring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6 Finitestring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 7 Waveequationwithmanyindependentvariables . . . . . . . . . . . . . . . . 46 8 Generalhyperbolicequations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 2 TheFouriermethod. . . ."

ThisbookisintendedtogivethereaderanopportunitytomastersolvingPDEpr- lems. Ourmaingoalwastohaveaconcisetextthatwouldcovertheclassicaltools ofPDEtheorythatareusedintoday'sscienceandengineering, suchaschar- teristics, thewavepropagation, theFouriermethod, distributions, Sobolevspaces, fundamentalsolutions, andGreen'sfunctions. WhileintroductoryFouriermethod -basedPDEbooksdonotgiveanadequatedescriptionoftheseareas, themore advancedPDEbooksarequitetheoreticalandrequireahighlevelofmathematical backgroundfromareader. Thisbookwaswrittenspeci?callyto?llthisgap, sat- fyingthedemandofthewiderangeofenduserswhoneedtheknowledgeofhow tosolvethePDEproblemsandatthesametimearenotgoingtospecializeinthis areaofmathematics. Arguably, thisistheshortestPDEcourse, whichstretchesfar beyondcommon, Fouriermethod-basedPDEtexts. Forexample, Hab03], which isacommonthoroughtextbookonpartialdifferentialequations, teachesasimilar setoftoolswhilebeingabout?vetimeslonger. Thebookisproblem-oriented. Thetheoreticalpartisrigorousyetshort. So- timeswereferthereadertotextbooksthatgivewidercoverageofthetheory. Yet, - portanttheoreticaldetailsarepresentedwithcare, whilethehintsgivethereaderan opportunitytorestoretheargumentstothefullrigor. Manyexamplesfromphysics areintendedtokeepthebookintuitiveforthereaderandtoillustratetheapplied natureofthesubject. Thebookwillbeusefulforanyhigher-levelundergraduatecourseandforse- studyforbothgraduateandhigher-levelundergraduatestudents, andforanys- cialtyinsciences. ItsRussianversionhasbeenastandardproblem-solvingmanual atMoscowStateUniversitysince1988, andisalsousedbystudentsofSt. Pete- burgUniversityandNovosibirskUniversities. ItsSpanishversionisusedatMorelia UniversityinMexico, whiletheEnglishdrafthasalreadybeenusedinViennaU- versityandatTexasA&MUniversity. Forfurtherreadingwerecommend Str92], Eva98], and EKS99]. Mu]nchen, AlexanderKomech August2007 AndrewKomech v Acknowledgements The?rstauthorisindebtedtoMargaritaKorotkinaforthefortunatesuggestionto writethisbook, toA. F. Filippov, A. S. Kalashnikov, M. A. Shubin, T. D. Ventzel, andM. I. Vishikforcheckingthe?rstversionofthemanuscriptandfortheadvice. BothauthorsaregratefultoH. Spohn(TechnischeUniversita]t, Mu]nchen)andto E. Zeidler(Max-PlanckInstituteforMathematics, Leipzig)fortheirhospitalityand supportduringtheworkonthebook. BothauthorsweresupportedbyInstituteforInformationTransmissionProblems (RussianAcademyofSciences). The?rstauthorwassupportedbytheDepartment ofMechanicsandMathematicsofMoscowStateUniversity, bytheAlexandervon HumboldtResearchAward, FWFGrantP19138-N13, andtheGrantsofRFBR. The secondauthorwassupportedbyTexasA&MUniversityandbytheNationalScience FoundationunderGrantsDMS-0621257andDMS-0600863. vii Contents 1 Hyperbolicequations. Methodofcharacteristics. . . . . . . . . . . . . . . . . . . 1 1 Derivationofthed'Alembertequation. . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Thed'Alembertmethodforin?nitestring . . . . . . . . . . . . . . . . . . . . . . 7 3 Analysisofthed'Alembertformula. . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 Second-orderhyperbolicequationsintheplane . . . . . . . . . . . . . . . . . 19 5 Semi-in?nitestring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6 Finitestring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 7 Waveequationwithmanyindependentvariables . . . . . . . . . . . . . . . . 46 8 Generalhyperbolicequations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 2 TheFouriermethod. . . ."

This monograph is the first to present the theory of global attractors of Hamiltonian partial differential equations. A particular focus is placed on the results obtained in the last three decades, with chapters on the global attraction to stationary states, to solitons, and to stationary orbits. The text includes many physically relevant examples and will be of interest to graduate students and researchers in both mathematics and physics. The proofs involve novel applications of methods of harmonic analysis, including Tauberian theorems, Titchmarsh's convolution theorem, and the theory of quasimeasures. As well as the underlying theory, the authors discuss the results of numerical simulations and formulate open problems to prompt further research.

This book presents a new and original method for the solution of boundary value problems in angles for second-order elliptic equations with constant coefficients and arbitrary boundary operators. This method turns out to be applicable to many different areas of mathematical physics, in particular to diffraction problems in angles and to the study of trapped modes on a sloping beach. Giving the reader the opportunity to master the techniques of the modern theory of diffraction, the book introduces methods of distributions, complex Fourier transforms, pseudo-differential operators, Riemann surfaces, automorphic functions, and the Riemann-Hilbert problem. The book will be useful for students, postgraduates and specialists interested in the application of modern mathematics to wave propagation and diffraction problems.

The focus of the present work is nonrelativistic and relativistic quantum mechanics with standard applications to the hydrogen atom. The author has aimed at presenting quantum mechanics in a comprehensive yet accessible for mathematicians and other non-physicists. The genesis of quantum mechanics, its applications to basic quantum phenomena, and detailed explanations of the corresponding mathematical methods are presented. The exposition is formalized (whenever possible) on the basis of the coupled Schroedinger, Dirac and Maxwell equations. Aimed at upper graduate and graduate students in mathematical and physical science studies.

This book gives a concise introduction to Quantum Mechanics with a systematic, coherent, and in-depth explanation of related mathematical methods from the scattering theory and the theory of Partial Differential Equations.The book is aimed at graduate and advanced undergraduate students in mathematics, physics, and chemistry, as well as at the readers specializing in quantum mechanics, theoretical physics and quantum chemistry, and applications to solid state physics, optics, superconductivity, and quantum and high-frequency electronic devices.The book utilizes elementary mathematical derivations. The presentation assumes only basic knowledge of the origin of Hamiltonian mechanics, Maxwell equations, calculus, Ordinary Differential Equations and basic PDEs. Key topics include the Schroedinger, Pauli, and Dirac equations, the corresponding conservation laws, spin, the hydrogen spectrum, and the Zeeman effect, scattering of light and particles, photoelectric effect, electron diffraction, and relations of quantum postulates with attractors of nonlinear Hamiltonian PDEs. Featuring problem sets and accompanied by extensive contemporary and historical references, this book could be used for the course on Quantum Mechanics and is also suitable for individual study.