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Published Online: 2008-06-09Published in Print: 2007-01-01Citation Information:Formalized Mathematics. Volume 15, Issue 3, Pages 127–136, ISSN (Online) 1898-9934, ISSN (Print) 1426-2630, DOI: https://doi.org/10.2478/v10037-007-0014-7, June 2008This content is open access.