# FI:IB107 Computability and Complexity - Course Information

## IB107 Computability and Complexity

**Faculty of Informatics**

Autumn 2023

**Extent and Intensity**- 2/1/0. 3 credit(s) (plus extra credits for completion). Recommended Type of Completion: zk (examination). Other types of completion: z (credit).

Taught in person. **Teacher(s)**- prof. RNDr. Jan Strejček, Ph.D. (lecturer)

Mgr. Jakub Balabán (seminar tutor)

RNDr. Martin Jonáš, Ph.D. (seminar tutor)

doc. RNDr. Petr Novotný, Ph.D. (seminar tutor)

Bc. David Dokoupil (assistant)

Bc. Ondřej Huvar (assistant)

RNDr. David Klaška (assistant)

Mgr. Martin Kurečka (assistant)

Bc. Tomáš Macháček (assistant)

RNDr. Vojtěch Suchánek (assistant)

Bc. Jakub Šárník (assistant)

Bc. Adéla Štěpková (assistant) **Guaranteed by**- prof. RNDr. Jan Strejček, Ph.D.

Department of Computer Science – Faculty of Informatics

Supplier department: Department of Computer Science – Faculty of Informatics **Timetable**- Wed 10:00–11:50 D1
- Timetable of Seminar Groups:

*J. Strejček*

IB107/02: Thu 16:00–16:50 A218,*J. Balabán*

IB107/03: Tue 16:00–16:50 A218,*M. Jonáš*

IB107/04: Tue 17:00–17:50 A218,*M. Jonáš*

IB107/05: Thu 9:00–9:50 A318,*P. Novotný*

IB107/06: Mon 17:00–17:50 A218,*J. Strejček* **Prerequisites**(in Czech)-
**IB005**Formal languages and Automata ||**IB102**Automata and Grammars **Course Enrolment Limitations**- The course is also offered to the students of the fields other than those the course is directly associated with.
**fields of study / plans the course is directly associated with**- there are 60 fields of study the course is directly associated with, display
**Course objectives**- The course introduces basic approaches and methods for classification of problems with respect to their algorithmic solvability. It explores theoretical and practical limits of computers usage and consequences these limitations have for advancing information technologies.

At the end of the course the students will be able: to understand basic notions of computability and complexity; to understand the main techniques used to classify problems (reductions, diagonalisation, closure properties), and to apply them in some simple cases. **Learning outcomes**- After enrolling the course student will be able to:

- use asymptotic notation, both actively and passively;

- explain difference between complexity of an algorithm and of a problem;

- independently decide to which complexity class a given problem belongs;

- do practical decisions based on a complexity classification of a particular problem;

- explain that some problems are not computable, give examples of such problems;

- explain the difference between various classes of not-computable problems; **Syllabus**- Algorithms and models of computation. Church thesis.
- Classification of problems. Decidable, undecidable, and partially decidable problems. Computable functions.
- Closure properties. Rice theorems.
- Computational complexity. Feasible and unfeasible problems.
- Reduction and completeness in problem classes. Many-one reduction and polynomial reduction. Complete problems with respect to decidability, NP-complete problems. Applications.

**Literature**- KOZEN, Dexter C.
*Automata and computability*. New York: Springer, 1997, xiii, 400. ISBN 0387949070. info - SIPSER, Michael.
*Introduction to the theory of computation*. Boston: PWS Publishing Company, 1997, xv, 396 s. ISBN 0-534-94728-X. info - BOVET, D. and Pierluigi CRESCENZI.
*Introduction to the theory of complexity*. New York: Prentice-Hall, 1994, xi, 282 s. ISBN 0-13-915380-2. info - KFOURY, A. J., Robert N. MOLL and Michael A. ARBIB.
*A programming approach to computability*. New York: Springer-Verlag, 1982, viii, 251. ISBN 0-387-90743-2. info

- KOZEN, Dexter C.
**Teaching methods**- lectures, support sessions, homeworks
**Assessment methods**- The course has a form of a lecture with a seminar. During the term students are assigned homeworks. The course is concluded by the written open-book exam. Student can attend the final exam providing she/he has acquired a given number of points from homeworks.
**Language of instruction**- Czech
**Follow-Up Courses****Further Comments**- Study Materials

The course is taught annually. **Listed among pre-requisites of other courses**

- Enrolment Statistics (recent)

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