Journal of Automated Reasoning

, Volume 55, Issue 3, pp 257–268 | Cite as

Definitional Expansions in Mizar

In memoriam of Andrzej Trybulec, a pioneer of computerized formalization
  • Artur KorniłowiczEmail author
Open Access


The Mizar Verifier uses definitional expansions for controlling proof structures. In this paper we propose another use of definitional expansions—enriching verified inferences by expansions of definitions of formulae included in the inferences and increasing the number of premises accessible by Checker. This introduces more knowledge to the reasoning, which helps to draw more conclusions. Some statistics about influence of such expansions on the Mizar Mathematical Library are presented.


Proof assistant Formal verification Definitional expansion Mizar 


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Authors and Affiliations

  1. 1.Institute of InformaticsUniversity of BiałystokBiałystokPoland

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