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\mathbb{K} is a rewrite-based executable semantic framework in which programming languages, type systems and formal analysis tools can be defined using configurations, computations and rules. Configurations organize the state in units called cells, which are labeled and can be nested. Computations carry computational meaning as special nested list structures sequentializing computational tasks, such as fragments of program. Computations extend the original language abstract syntax. K (rewrite) rules make it explicit which parts of the term they read-only, write-only, read-write, or do not care about. This makes K suitable for defining truly concurrent languages even in the presence of sharing. Computations are like any other terms in a rewriting environment: they can be matched, moved from one place to another, modified, or deleted. This makes K suitable for defining control-intensive features such as abrupt termination, exceptions or call/cc.

Quick Overview

  • A ten-minute overview video slide presentation.
  • The documented K semantics of 25px-Pdf_icon.png LAMBDA, 25px-Pdf_icon.png IMP and 25px-Pdf_icon.png KOOL (generated by the K Tool); more semantics available below.
  • [Optional] A high-level interview about rewrite-based semantics (Wolfram Schulte interviews Grigore Rosu at ICSE'11).
  • FAQ

K Tool Download and Online Interface

  • The provided K tool binaries are supported on Linux, OS X, and Windows. Other platforms may or may not work correctly. We welcome information about usability of unsupported platforms or bugs in the supported platforms.
  • The source code (Java) is available on Github, where you can also report bugs (please do so). In the Github k-editor-support repository you can additionally find K syntax highlighting definitions for various popular editors/IDEs. Please feel free to contribute.
  • An experimental online interface to the K tool is also available, as well as a legacy interface (in Romania).
  • Subscribe to the K user list for technical questions and news on major tool updates. Ask general, non-technical questions at

Learn K

  • Do the K Tutorial !
  • Read some papers about K (click on Publications in the left tab).


K and matching logic webpage at UIUC (USA).
K webpage at UAIC (Romania).
Matching logic webpage at UIUC (USA).

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