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Published Online: 2009-03-20Published in Print: 2008-01-01Citation Information:Formalized Mathematics. Volume 16, Issue 4, Pages 401–403, ISSN (Online) 1898-9934, ISSN (Print) 1426-2630, DOI: https://doi.org/10.2478/v10037-008-0048-5, March 2009This content is open access.