About this article
Published Online: Jul 09, 2022
Page range: 249 - 278
Accepted: Nov 30, 2021
DOI: https://doi.org/10.2478/forma-2021-0023
Keywords
© 2022 Sebastian Koch, published by Sciendo
This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.
In this article the sum (or disjoint union) of graphs is formalized in the Mizar system [4], [1], based on the formalization of graphs in [9].