Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Nelson Martins-Ferreira"'
Publikováno v:
Mathematics, Vol 12, Iss 7, p 996 (2024)
A generalized construction procedure for algebraic number systems is hereby presented. This procedure offers an efficient representation and computation method for complex numbers, quaternions, and other algebraic structures. The construction method
Externí odkaz:
https://doaj.org/article/eed44ea068ec4f079e8a9e9881020e68
Autor:
Nelson Martins-Ferreira
Publikováno v:
Mathematics, Vol 11, Iss 3, p 660 (2023)
While surveying some internal categorical structures and their applications, it is shown that triangulations and internal groupoids can be unified as two different instances of the same common structure, namely a multi-link. A brief survey includes t
Externí odkaz:
https://doaj.org/article/18c6103a78d14bfe99389124f6720002
Autor:
Nelson Martins-Ferreira
Publikováno v:
Axioms, Vol 11, Iss 2, p 49 (2022)
The structure of topological spaces is analysed here through the lenses of fibrous preorders. Each topological space has an associated fibrous preorder and those fibrous preorders which return a topological space are called spatial. A special class o
Externí odkaz:
https://doaj.org/article/e45c6615a6d74c998beba77ec893dc04
Publikováno v:
Logical Methods in Computer Science, Vol Volume 13, Issue 3 (2017)
In the context of protomodular categories, several additional conditions have been considered in order to obtain a closer group-like behavior. Among them are locally algebraic cartesian closedness and algebraic coherence. The recent notion of S-proto
Externí odkaz:
https://doaj.org/article/59afd254ea4841988f5240731202c888
Publikováno v:
Indagationes Mathematicae.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9162414e383b004463424c17c50df32e
https://doi.org/10.1016/j.indag.2023.03.007
https://doi.org/10.1016/j.indag.2023.03.007
Publikováno v:
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
The authors are grateful to George Janelidze for fruitful discussions on the topic of the present paper, and to the referee for several suggestions that helped to improve the final version of the paper. The first author was partially supported by Cen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be5b8ffd8dacebf5b794866c34bff51e
https://doi.org/10.1016/j.jpaa.2019.01.006
https://doi.org/10.1016/j.jpaa.2019.01.006
Publikováno v:
Applied Mechanics and Materials. 890:61-69
This work is concerned with 3D printing. It's main goal is to establish a conceptualsetting in which the theory of 3D printing can be developed. Following the analogy that aUniversal Turing Machine, in a veryprecise and specific way, computes everyth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ce882ec128e3c0275b505390fc4192fc
https://doi.org/10.4028/www.scientific.net/amm.890.61
https://doi.org/10.4028/www.scientific.net/amm.890.61
Properties of preordered monoids are investigated and important subclasses of such structures are studied. The corresponding full subcategories are related between them by appropriate functors as well as with the categories of preordered sets and of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f42197f06dddc8bd172f9061024be948
https://hdl.handle.net/10400.8/8254
https://hdl.handle.net/10400.8/8254
Autor:
Nelson Martins-Ferreira
Publikováno v:
Axioms; Volume 11; Issue 2; Pages: 49
The structure of topological spaces is analysed here through the lenses of fibrous preorders. Each topological space has an associated fibrous preorder and those fibrous preorders which return a topological space are called spatial. A special class o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f54fb164ba6b92e33228eb59a33c8f4
Publikováno v:
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
We show that any regular (right) Schreier extension of a monoid M by a monoid A induces an abstract kernel Φ : M → End ( A ) Inn ( A ) {\Phi\colon M\to\frac{\operatorname{End}(A)}{\operatorname{Inn}(A)}} . If an abstract kernel factors thr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c2d36e122c400986a4e42f2ad40eae03