Winter 2016/17
Differentialgleichungen II
PD Dr. Martin Väth
Exercises: Nicola Vassena
Schedule, Winter 2016/17
 Lecture:
 Monday 14.1516.00, SR 032, Arnimallee 6
 Wednesday, 10.1512.00, SR E.31, Arnimallee 7
 Exercises:
 Monday, 16.0017.45, SR 032, Arnimallee 6
On the first day of the semester (Monday, 17.10.2016), instead of lecture
and exercise there will be the Nachklausur (repetition of the final
exam) of Differentialgleichungen I
Dates to look up the Exam: October 19November 2, 2016,
Room 136, Arnimallee 7. If I should not be there, ask in the office 142
(or better fix a date with me e.g. by email).
Registration
Please register (in addition to the standard registration) into KVV.
This is not a substitute for the standard registration and has no obligations;
for instance, you need not be afraid to register into KVV if you are not
sure yet whether you will join the course, but it will help us in
organizing things.
Instructions to do this:
 Go to the KVV homepage.
 Login with Direkter KVVLogin with your ZEDAT account.
(If you do not have a ZEDAT account and cannot easily get one,
please ask after lecture or exercises.)
 Go to Membership, choose Joinable Sites, choose the lecture
(Basismodul: Differentialgleichungen II) and press the join button.
Content
The plan is to divide the lecture roughly into 3 parts:
 A primer on advanced techniques for dynamical systems
(HartmanGrobman theorem, Ljapunov function techniques, stable and unstable
manifolds, a sketch on center manifolds and how they are applied)
 A primer on PDEs (the crucial 3 classes of PDEs 
elliptic, parabolic, hyperbolic  with their main examples Laplace, heat, and
wave equation), followed by functional analytical techniques (Sobolev spaces
together with their main embedding theorems and inequalities,
L_{2} theory for elliptic equations)
 Semilinear parabolic and hyperbolic PDEs: Semigroup theory (for analytic and
C_{0} semigroups, respectively) and the corresponding functional analytic
background for unbounded operators.
This is a very huge program, and presumably either from the second or third part
some topics (or at least some proofs) have to be omitted: It will depend on the
audience what will be considered in more detail. Since the presumed main audience
will be from Differentialgleichungen I,
presumably no preknowledge will be expected in functional analysis or PDEs.
For the first part, knowledge in basic differential equations is required,
and hopefully the concept of a flow is not completely new.
For the other parts, knowledge in Lebesgue integration theory is recommended,
although probably a small sketch of its main concepts will be recalled.
Literature
For the first part (in decreasing order of relevance for the lecture):
 H. Amann, Ordinary differential equations, Walter de Gruyter, 1990
 G. Teschl, Ordinary Differential Equations and Dynamical Systems, American Mathematical Society, 2012
 J. W. Prüss and M. Wilke, Gewöhnliche Differentialgleichungen und Dynamische Systeme, Birkäuser, 2010
 P. Hartman, Ordinary Differential Equations, Cambridge University Press, 2002
 A. Vanderbauwhede, Center Manifolds, Normal Forms and Elementary Bifurcations, In: Dynamics Reported, Vol. 2, Wiley, 1989
For the second (and partly third) part:
 H. Brezis, Functional analysis, Sobolev spaces, and partial differential equations, Springer, New York, Dordrecht, Heidelberg, London, 2011
 L. C. Evans, Partial differential equations, 2nd ed., Amer. Math. Soc., Providence, R. I., 2010
 H. W. Alt, Lineare Funktionalanalysis, 2nd ed., Springer, Berlin, Heidelberg, New York, 1992
 L. V. Kantorovich and G. P. Akilov, Functional analysis, 2nd ed., Pergamon Press, Oxford, 1982
 J. Appell and M. Väth, Elemente der Funktionalanalysis, Vieweg & Sohn, Braunschweig, Wiesbaden, 2005
 M. Väth, Integration theory. A second course, World Scientific Publ., Singapore, New Jersey, London, Hong Kong, 2002
 T. Kato, Perturbation theory for linear operators, Springer, New York, 1966
 D. Werner, Funktionalanalysis, 4th ed., Springer, Berlin, Heidelberg, New York, 2002
 N. Dunford and J. T. Schwartz, Linear operators I, 3rd ed., Int. Publ., New York, 1966
 H. Triebel, Interpolation theory, function spaces, differential operators, NorthHolland, Amsterdam, New York, Oxford, 1978
For the third (and partly second) part:
 A. Pazy, Semigroups of linear operators and applications to partial differential equations, Springer, New York, Berlin, Heidelberg, 1992
 D. Henry, Geometric theory of semilinear parabolic equations, Lect. Notes Math. 840, Springer, Berlin, New York, 1981
 H. Amann, Linear and quasilinear parabolic problems I , Birkhäuser, Basel, Boston, Berlin, 1995
 A. BelleniMorante and A. C. McBride, Applied nonlinear semigroups, John Wiley & Sons, Chichester, New York, Weinheim, 1998
 A. Lunardi, Analytic semigoups and optimal regularity in parabolic problems, Birkhäuser, Basel, Boston, Berlin, 1994
 E. Hille and R. S. Phillips, Functional analysis and semigroups, Amer. Math. Soc. Coll. Publ., Providence, R. I., 1957
 I. I. Vrabie, C_{0}semigroups and applications, 2nd ed., Elsevier, Amsterdam, 2003
 E. M. Ouhabaz, Analysis of heat equations on domains, Princeton Univ. Press, Princeton, Oxford, 2005
Most of these books are in the library in the "Handapparat".
Dates for the Exam (Klausur)
The Klausur will be on February 8, 2017 during lecture.
Start of the Klausur already on 10:00
You can bring one (A4) paper with you for the exam on which you can have
written whatever you want. Please also bring empty paper and a pen with you!
Nothing else is admissible (in particular: no calculators, computers,
smartphones, books, lecture notes etc.)
Exercises for winter 2016/17 and their finishing dates
For attending the final exam, every person needs to obtain 50% of the total points of the exercises and, in addition, must regularly have presented solutions to the exercises in the tutorials. ("Regularly" means at the very least 13 times, depending on the total number of exercises and how they are split, and on the number of attendants.)
Please form groups of not more than three people and hand in your joint solutions. Please note clearly your name and Matrikelnummer on your solutions. Please staple your solutions together if you hand in multiple pages.
The last date in which you can hand in is Wednesday 20:00; you can put your solutions into Nicola Vassena's box (Tutorenfächer) in Arnimallee 3, ground floor (just beside the stairs).
Please write the solutions to the exercises in English (because they are corrected by Nicola)!
 exercise01.pdf October 26, 2016
 exercise02.pdf November 2, 2016
 exercise03.pdf November 9, 2016
 exercise04.pdf November 16, 2016
 exercise05.pdf November 23, 2016
 exercise06.pdf November 30, 2016
 exercise07.pdf December 7, 2016
 exercise08.pdf December 14, 2016
 exercise09.pdf January 9, 2017
 exercise10.pdf January 11, 2017
 exercise11.pdf January 18, 2017
 exercise12.pdf January 25, 2017
 exercise13.pdf February 1, 2017
Suggestions for some solutions of current exercises
The solutions will be online only for 12 weeks after the finishing dates.
 solution01.pdf
 solution02.pdf
 solution03.pdf
 solution04.pdf
 solution06.pdf
 solution07.pdf
 solution08.pdf
 solution09.pdf
 solution10.pdf
 solution11.pdf
 solution12.pdf
 solution13.pdf
 circle.pdf
(Characterization of 1dimensional manifolds)
Manuscript
The current manuscript will be online only for 12 weeks after the corresponding lecture.
For part 1, the manuscript is in German, the later parts will be in English.
 dgl1.pdf
 dgl2a_01.pdf
 dgl2a_02.pdf
 dgl2b_01.pdf
 dgl2b_02.pdf
 dgl2b_03.pdf
 dgl2b_04.pdf
 dgl2b_05.pdf New version on January 23: Fix wrong signs in weak formulation of Neumann case and typos in coercivity estimate (p. 38).
Formulate GagliardoNirenberg slightly more general.
 dgl2b_06.pdf (Proof of main embedding theorems)
 dgl2b_07.pdf (C_{0} semigroups, part 12)
 dgl2b_08.pdf (C_{0} semigroups, part 22)
