Published Online: Dec 31, 2023
Page range: 325 - 339
Accepted: Dec 18, 2023
DOI: https://doi.org/10.2478/forma-2023-0026
Keywords
© 2023 Roland Coghetto et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
In the article, we continue the formalization of the work devoted to Tarski’s geometry – the book “Metamathematische Methoden in der Geometrie” by W. Schwabhäuser, W. Szmielew, and A. Tarski. We use the Mizar system to formalize Chapter 9 of this book. We deal with half-planes and planes proving their properties as well as the theory of intersecting lines.