Abstract
The main aim of this article is to show how the notion of refutation has been changing in logic for the last few years. The idea of refutation was known to Aristotle, but the formal concept was introduced by Jan Łukasiewicz. Afterwards this notion was investigated by the Polish group of logicians headed by Jerzy Slupecki. Several interesting articles about refutation have appeared in the last years. In this article, I present in outline the history of the notion of refutation and I discuss recent applications of refutation systems both in the theoretical and practical approach.
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