Twenty-Third International Conference on Computability and Complexity in Analysis

July 29-31, 2026, Trier, Germany

Trier


Scope

The conference is concerned with the theory of computability and complexity over real-valued data.

Computability and complexity theory are two central areas of research in mathematical logic and theoretical computer science. Computability theory is the study of the limitations and abilities of computers in principle. Computational complexity theory provides a framework for understanding the cost of solving computational problems, as measured by the requirement for resources such as time and space. The classical approach in these areas is to consider algorithms as operating on finite strings of symbols from a finite alphabet. Such strings may represent various discrete objects such as integers or algebraic expressions, but cannot represent general real or complex numbers, unless they are rounded.

Most mathematical models in physics and engineering, however, are based on the real number concept. Thus, a computability theory and a complexity theory over the real numbers and over more general continuous data structures is needed. Despite remarkable progress in recent years many important fundamental problems have not yet been studied, and presumably numerous unexpected and surprising results are waiting to be detected.

Scientists working in the area of computation on real-valued data come from different fields, such as theoretical computer science, domain theory, logic, constructive mathematics, computer arithmetic, numerical mathematics and all branches of analysis. The conference provides a unique opportunity for people from such diverse areas to meet, present work in progress and exchange ideas and knowledge.

The topics of interest include foundational work on various models and approaches for describing computability and complexity over the real numbers. They also include complexity-theoretic investigations, both foundational and with respect to concrete problems, and new implementations of exact real arithmetic, as well as further developments of already existing software packages. We hope to gain new insights into computability-theoretic aspects of various computational questions from physics and from other fields involving computations over the real numbers.

CCA 2026 is held as a satellite event of CiE 2026, Computability in Europe, July 27-31, 2026, Trier, Germany.

Topics

  • Computable analysis
  • Complexity on real numbers
  • Computable numbers, subsets and functions
  • Theory of representations
  • Computable differential equations
  • Randomness and computable measure theory
  • Algorithmic fractal dimension
  • Effective descriptive set theory
  • Weihrauch complexity
  • Reverse analysis
  • Constructive analysis
  • Domain theory and analysis
  • Realizability theory and analysis
  • Models of computability on real numbers
  • Real number algorithms
  • Exact real number arithmetic
Poster

Tutorial Speaker (jointly with CiE 2026 and MCU 2026)

Invited Speakers

Contributed Talks

Scientific Programme Committee

Organizing Committee

Organizational Aspects

Registration

You can register for CCA 2026 on the following web page: We distinguish between full registration and student registration.

Fees cover, among other things, local public transport, meals and coffee breaks at the university, access to rooms.

The conference is planned primarily as an in-person event. However, for those unable to attend on site, an option for remote participation will be provided on a best-effort basis.
If you plan to attend only remotely, please do NOT register but just send an email to Norbert Müller

Funding and Sponsoring

ASL

Submissions

Authors are invited to submit 1-2 pages abstracts in PDF format, including references via the following web page: If full versions of papers are already available as technical report or arXiv version, then corresponding links should be added to the reference list. Final versions of abstracts might be distributed to participants in hardcopy and/or in electronic form.

Dates

CCA Steering Committee

Vasco Brattka, chair (Munich, Germany and Cape Town, South Africa), Peter Hertling (Munich, Germany), Mathieu Hoyrup (Nancy, France), Zvonko Iljazović (Zagreb, Croatia), Akitoshi Kawamura (Kyoto, Japan), Arno Pauly (Swansea, UK), Klaus Weihrauch (Hagen, Germany), Ning Zhong (Cincinnati, USA), Martin Ziegler (Daejeon, Republic of Korea)

Further Information

For further information, please contact

Participants at CCA 1996

Participants at CCA 1996 in Trier, almost 30 years ago.