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Formalized Mathematics

(a computer assisted approach)

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Volume 15, Issue 3 (Jan 2007)

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Mizar Analysis of Algorithms: Preliminaries

Grzegorz Bancerek
  • Department of Theoretical Computer Science, Białystok Technical University, Poland
Published Online: 2008-06-09 | DOI: https://doi.org/10.2478/v10037-007-0011-x

Mizar Analysis of Algorithms: Preliminaries

Algorithms and its parts - instructions - are formalized as elements of if-while algebras. An if-while algebra is a (1-sorted) universal algebra which has 4 operations: a constant - the empty instruction, a binary catenation of instructions, a ternary conditional instruction, and a binary while instruction. An execution function is defined on pairs (s, I), where s is a state (an element of certain set of states) and I is an instruction, and results in states. The execution function obeys control structures using the set of distinguished true states, i.e. a condition instruction is executed and the continuation of execution depends on if the resulting state is in true states or not. Termination is also defined for pairs (s, I) and depends on the execution function. The existence of execution function determined on elementary instructions and its uniqueness for terminating instructions are shown.

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About the article


Published Online: 2008-06-09

Published in Print: 2007-01-01


Citation Information: Formalized Mathematics, ISSN (Online) 1898-9934, ISSN (Print) 1426-2630, DOI: https://doi.org/10.2478/v10037-007-0011-x.

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