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Publicado en línea: 09 ene 2021
Páginas: 155 - 171
Aceptado: 19 may 2020
DOI: https://doi.org/10.2478/forma-2020-0014
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© 2020 Sebastian Koch, published by Sciendo
This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.
In this article the union and intersection of a set of graphs are formalized in the Mizar system [5], based on the formalization of graphs in [7].