Zobrazeno 1 - 10
of 6 322
pro vyhledávání: '"Spier, A"'
In this paper we prove a conjecture by Wocjan, Elphick and Anekstein (2018) which upper bounds the sum of the squares of the positive (or negative) eigenvalues of the adjacency matrix of a graph by an expression that behaves monotonically in terms of
Externí odkaz:
http://arxiv.org/abs/2411.08184
Autor:
Collados-Rodriguez, Carlos, Spier, Daniel Westerman, Cheah-Mane, Marc, Prieto-Araujo, Eduardo, Gomis-Bellmunt, Oriol
In this paper, frequency dynamics in modern power systems with a high penetration of converter-based generation is analysed. A fundamental analysis of the frequency dynamics is performed to identify the limitations and challenges when the converter p
Externí odkaz:
http://arxiv.org/abs/2411.08161
Autor:
Coutinho, Gabriel, Spier, Thomás Jung
In this short paper we prove that the sum of the squares of negative (or positive) eigenvalues of the adjacency matrix of a graph is lower bounded by the sum of the degrees divided by the vector chromatic number, resolving a conjecture by Wocjan, Elp
Externí odkaz:
http://arxiv.org/abs/2308.04475
We prove that the only trees that admit perfect state transfer according to the adjacency matrix model are $P_2$ and $P_3$. This answers a question first asked by Godsil in 2012 and proves a conjecture by Coutinho and Liu from 2015.
Externí odkaz:
http://arxiv.org/abs/2305.10199
The main result of this paper states that in a rooted product of a path with rooted graphs which are disposed in a somewhat mirror-symmetric fashion, there are distinct eigenvalues supported in the end vertices of the path which are too close to each
Externí odkaz:
http://arxiv.org/abs/2305.09406
Autor:
Troy E. Spier
Publikováno v:
Lenguaje, Vol 52, Iss 02 (2024)
The relationship between Latin America and the so-called ‘Muslim World’ is a tenuous one, as public perceptions of Muslims are generally quite negative despite consistent, typically economically beneficial historical and contemporary immigration
Externí odkaz:
https://doaj.org/article/4bd1e0129cdc40d39adebc66a7751a28
Autor:
Coutinho, Gabriel, Baptista, Pedro Ferreira, Godsil, Chris, Spier, Thomás Jung, Werner, Reinhard
The adjacency matrix of a graph G is the Hamiltonian for a continuous-time quantum walk on the vertices of G. Although the entries of the adjacency matrix are integers, its eigenvalues are generally irrational and, because of this, the behaviour of t
Externí odkaz:
http://arxiv.org/abs/2208.08971
We prove that no tree contains a set of three vertices which are pairwise strongly cospectral. This answers a question raised by Godsil and Smith in 2017.
Comment: 13 pages
Comment: 13 pages
Externí odkaz:
http://arxiv.org/abs/2206.02995
Autor:
Yin, Xiaoyu, Richardson, Marcy, Laner, Andreas, Shi, Xuemei, Ognedal, Elisabet, Vasta, Valeria, Hansen, Thomas v.O., Pineda, Marta, Ritter, Deborah, de Dunnen, Johan, Hassanin, Emadeldin, Lin, Wencong Lyman, Borras, Ester, Krahn, Karl, Nordling, Margareta, Martins, Alexandra, Mahmood, Khalid, Nadeau, Emily, Beshay, Victoria, Tops, Carli, Genuardi, Maurizio, Pesaran, Tina, Frayling, Ian M., Capellá, Gabriel, Latchford, Andrew, Tavtigian, Sean V., Maj, Carlo, Plon, Sharon E., Greenblatt, Marc S., Macrae, Finlay A., Spier, Isabel, Aretz, Stefan
Publikováno v:
In The American Journal of Human Genetics 7 November 2024 111(11):2427-2443
Autor:
Vogel, Julia Moore, Pollack, Beth, Spier, Ezra, McCorkell, Lisa, Jaudon, Toni Wall, Fitzgerald, Megan, Davis, Hannah, Cohen, Alison K.
Publikováno v:
In Life Sciences 15 October 2024 355