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Some questions about Zadeh's extension on metric spaces
(Elsevier, 2018-10-29)
For
a
continuous
function
f
on
a
Hausdorff
space
X
,
we
prove
that
[
̂
f(u)
]
α
=
f(u
α
)
for
each
u
∈
F
(X)
and
α
∈[
0
,
1
]
,
where
̂
f
is
the
Zadeh’s
extension
of
f
.
By
...
A dichotomy property for locally compact groups
(Elsevier, 2018-08)
We extend to metrizable locally compact groups Rosenthal's theorem describing those Banach spaces containing no copy of l1. For that purpose, we transfer to general locally compact groups the notion of interpolation (Io) ...
Conjugacy classes and union of cosets of normal subgroups
(Springer Nature, 2023)
Let G be a finite group, N a normal subgroup of G and K a conjugacy class of G. We prove that if K∪K−1 is union of cosets of N, then N is soluble, K is a real-imaginary class, that is, every irreducible character of G takes ...
Existence of normal Hall subgroups by means of orders of products
(Wiley-VCH Verlag, 2018)
Let G be a finite group, let π be a set of primes and let p be a prime. We characterize the existence of a normal Hall π‐subgroup in G in terms of the order of products of certain elements of G. This theorem generalizes a ...
Stability of King’s family of iterative methods with memory
(Elsevier, 2017-07)
In the literature exist many iterative methods with memory for solving nonlinear equations, the most of them designed in the last years. As they use the information of (at least) the two previous iterates to generate the ...
A Survey of Meteoric Activity over Spain during the Eighth–Fifteenth Centuries
(SAGE Publications, 2016)
The lack of astronomical observations from Medieval and early Modern Spanish sourcesis a constant in the records of solar eclipses, meteors and other celestial phenomena. This may be partially explained by the absence of ...
Spatio-temporal point patterns on linear networks: Pseudo-separable intensity estimation
(Elsevier, 2020)
Aside from reviewing different intensity estimation schemesfor point processes on linear networks, this paper introducestwo Voronoi-based intensity estimation approaches for spatio-temporal linear network point processes. ...
Plant‑feeding may explain why the generalist predator Euseius stipulatus does better on less defended citrus plants but Tetranychus‑specialists Neoseiulus californicus and Phytoseiulus persimilis do not
(Springer, 2021-01-22)
The generalist predator Euseius stipulatus (Athias-Henriot) and the Tetranychidae-specialist predators Neoseiulus californicus (McGregor) and Phytoseiulus persimilis Athias-Henriot play a key role in the regulation of ...
A first‐order, ratio‐based nonparametric separability test for spatiotemporal point processes
(2018-02)
Testing whether the intensity function of a spatiotemporal point process is sep-
arable should be one of the first steps in the analysis of any observed pattern.
Under separability, the risk of observing an event at time ...
A criterion for a normal subgroup to be hypercentral based on class sizes
(Springer, 2024)
Let G be a finite group and N a normal subgroup of G. We prove that the knowledge of the sizes of the conjugacy classes of G that are contained in N and of their multiplicities provides information of N in relation to the ...