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Publicado en línea: 09 jul 2022
Páginas: 249 - 278
Aceptado: 30 nov 2021
DOI: https://doi.org/10.2478/forma-2021-0023
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© 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].