NMAK10019U  Differential operators and function spaces (DifFun)

Volume 2016/2017

MSc programme in Mathematics


Differential operators. Distribution theory, Fourier transform of distributions. Function spaces. Applications to concrete differential operator problems.

Learning Outcome


  • Linear differential equations and thei relevant side conditions (e.g. boundary, initial)
  • Concept of ellipticity
  • Distributions and their convergence properties
  • Multiplication by smooth functions and derivatives of distributions
  • Fourier transform of distributions
  • Function classes such as Sobolev spaces or Lp spaces and the action on differnetial operators and  the Fourier transform on these
  • Unbounded operators on Hilbert spaces
  • Solution methods for differential equations such as methods based on the Fourier transform or a variational approach



  • Understand the different realizations of differential operators on relevant function spaces
  • Understand concepts such as existence uniqueness and regularity of solutions to differential equations within the relevant function spaces
  • Determine when a certain solution method applies
  • Calculate with distributions (derivatives, multiplication, ...)
  • Calculate Fourier transform of distributions, and functions in different function classes
  • Know the relations (inclusions) of relevant function spaces



  • Solve classical differential equations
  • Establish existence, uniqueness and regularity of solutions to certain differential equations
  • Describe the different realizations of concrete differential operators on Hilbert spaces
  • Calculate properties (e.g., domain, spectra) of realizations of differential operators
A knowledge of Banach and Hilbert spaces Corresponding to An1 and An2.
Knowledge of the Fourier transform corresponding to FunkAn is desirable.
5 hours of lectures and 2 hours of exercises each week for 8 weeks
7,5 ECTS
Type of assessment
Continuous assessment, Two 1 week take home assignments
Written examination, 3 hours under invigilation
The two written 1 week take home assignments count each 20% toward the final grade. The final exam counts 60%
All aids allowed

NB: If the exam is held at the ITX, the ITX will provide computers. Private computers, tablets or mobile phones CANNOT be brought along to the exam. Books and notes should be brought on paper or saved on a USB key.

Marking scale
7-point grading scale
Censorship form
External censorship

Skriftlig prøve, 3 timer med opsyn. Efter prøven udregnes to pointtal - et hvor den skriftlige prøve tæller 100 % og et hvor den skriftlige prøve tæller 60 % og opgaverne som er afleveret i løbet af kurset ræller 40 %. Den endelig karakter baseres på det af de to pointtal, der er højest.

Criteria for exam assesment

The student must in a satisfactory way demonstrate that he/she has mastered the learning outcome.

  • Category
  • Hours
  • Lectures
  • 40
  • Theory exercises
  • 16
  • Exam
  • 20
  • Guidance
  • 13
  • Preparation
  • 117
  • Total
  • 206