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Publicado en línea: 06 abr 2021
Páginas: 239 - 249
Aceptado: 25 sept 2020
DOI: https://doi.org/10.2478/forma-2020-0021
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© 2020 Sebastian Koch, published by Sciendo
This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.
This article introduces extended natural numbers, i.e. the set ℕ ∪ {+∞}, in Mizar [4], [3] and formalizes a way to list a cardinal numbers of cardinals. Both concepts have applications in graph theory.