Yannick Forster

Saarland University Computer Science

About me

I am a PhD student at the Saarbrücken Graduate School of Computer Science and the Programming Systems Lab under supervision of Gert Smolka.

I am working on the strong invariance thesis for the call-by-value lambda calculus with the long-term goal of using this calculus as a formal basis for complexity theory. I am also working on constructive formalisations of computability theory and undecidability proofs and I am interested in the theory and formalisation of computational effects.

I obtained my Bachelor's degree at Saarland University and my Master's degree at the University of Cambridge.

CV - Google Scholar - dblp - GitHub

Yannick Forster


Towards a library of formalised undecidable problems in Coq: The undecidability of intuitionistic linear logic (slides)
Yannick Forster and Dominique Larchey-Wendling
LOLA 2018, Oxford, UK, 2018.

Formal Small-step Verification of a Call-by-value Lambda Calculus Machine
Fabian Kunze, Gert Smolka, Yannick Forster
Preprint, arxiv 1806.03205

Verification of PCP-Related Computational Reductions in Coq (slides)
Yannick Forster, Edith Heiter, Gert Smolka
ITP 2018, Oxford, UK, 2018. Pre-print on arxiv.

The strong invariance thesis for a lambda-calculus (slides)
Yannick Forster, Fabian Kunze, Marc Roth
LOLA 2017, Reykjavik, Iceland, 2017.

Weak Call-by-Value Lambda Calculus as a Model of Computation in Coq (pdf) (slides)
Yannick Forster and Gert Smolka
ITP 2017, Brasilia, Brazil, 2017.

On the Expressive Power of User-Defined Effects: Effect Handlers,
Monadic Reflection, Delimited Control

Yannick Forster, Ohad Kammar, Sam Lindley, Matija Pretnar
ICFP 2017, Oxford, UK, 2017.

Verified Extraction from Coq to a Lambda-Calculus (pdf) (slides)
Yannick Forster and Fabian Kunze
Coq Workshop 2016, ITP 2016, Nancy, France, 2016.

On the expressive power of effect handlers and monadic reflection (pdf)
Yannick Forster
Master's Thesis, Robinson College, University of Cambridge, 2016.

A Formal and Constructive Theory of Computation (pdf)
Yannick Forster
Bachelor's Thesis, Programming Systems Lab, Saarland University, 2014.

Supervised Students

Edith Heiter, 2017, Bachelor's thesis, co-supervised with Gert Smolka
Undecidability of the Post Correspondence Problem in Coq

Maximilian Wuttke, 2017, Bachelor's thesis (in progress)
Formalising Turing machines in Coq


Summer 2018 Organiser and Lecturer
Advanced Coq Programming
Block course, Programming Systems Lab.
Winter 2017 Adviser
Category Theory
Seminar, Programming Systems Lab.
Summer 2017 Organiser
Mathematics Precourse
Saarland University.
Summer 2017 Organiser
Didactic Seminar for Student TAs in Programming 1
Reactive Systems Group.
Summer 2017 TA
Introduction to Computational Logic
Core course, Programming Systems Lab.
Summer 2017 Adviser
Category Theory
Seminar, Programming Systems Lab.
Winter 2016 Adviser
Funktionale Programmierung
Proseminar, Programming Systems Lab.
Summer 2016 Lecturer, Coach and Organiser
Mathematics Precourse
Saarland University.
Summer 2015 Part of the organisation team
Mathematics Precourse
Saarland University.
Winter 2014/2015 Organiser
Didactic Seminar for Re-exam Student TAs
Reactive Systems Group.
Winter 2014/2015 Supervision Student TA
Programming 1
Basic course, Reactive Systems Group.
Summer 2014 Student TA
Introduction to Computational Logic
Core course, Programming Systems Lab.
Winter 2013/2014 Student TA
Programming 1
Basic course, Dependendable Systems Group.
Summer 2013 Student TA
Mathematics Precourse
Saarland University.


Mail: forster at ps.uni-saarland.de
Adress: Saarland University,
Saarland Informatics Campus E1 3, Rm 523
66123 Saarbr├╝cken
Phone: +49 (0)681 / 302-5626

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