Formalized Mathematics
Special Issue: 25 years of the Mizar Mathematical Library
About this article
Published Online: Jun 30, 2014
Page range: 99 - 103
Received: May 25, 2014
DOI: https://doi.org/10.2478/forma-2014-0011
Keywords
© 2014 Marco B. Caminati and Artur Korniłowicz
This work is licensed under the Creative Commons Attribution-ShareAlike 3.0 License. (CC BY-SA 3.0)
An original result about Hilbert Positive Propositional Calculus introduced in [11] is proven. That is, it is shown that the pseudo-canonical formulae of that calculus (and hence also the canonical ones, see [17]) are a subset of the classical tautologies.