606 research outputs found
Cleft Extensions and Quotients of Twisted Quantum Doubles
Given a pair of finite groups and a normalized 3-cocycle of
, where acts on as automorphisms, we consider quasi-Hopf algebras
defined as a cleft extension where denotes
some suitable cohomological data. When is a
quotient of by a central subgroup acting trivially on , we give
necessary and sufficient conditions for the existence of a surjection of
quasi-Hopf algebras and cleft extensions of the type . Our
construction is particularly natural when acts on by conjugation, and
is a twisted quantum double . In
this case, we give necessary and sufficient conditions that
Rep() is a modular
tensor category.Comment: LaTex; 14 page
Little Golden Blond : Morceau de Salon
https://digitalcommons.library.umaine.edu/mmb-ps/1216/thumbnail.jp
Molecular diversity of the Metarhizium anisopliae lineage in an agricultural field
Entomopathogenic fungal isolates identified by morphology as Metarhizium anisopliae may belong to different species when identified by molecular characters. We isolated Metarhizium spp. from an experimental agricultural field under both conventional and organic farming regimes using Tenebrio molitor as bait insect to assess the molecular diversity within the soil. Isolates were analyzed using DNA sequencing and applying SSR markers. Within the former M. anisopliae lineage, we found M. brunneum (86.3%), M. robertsii (11.3%) and M. majus (3.4%) in the soil samples. Several genotypes of each species were identified based on SSR markers. Differences in abundance of the species and their genotypes suggest different adaptations to the soil environment of the agricultural field. There were no effects of conventinal or organic farming regimes on diversity of the fungi
Green's Relations in Finite Transformation Semigroups
We consider the complexity of Green's relations when the semigroup is given
by transformations on a finite set. Green's relations can be defined by
reachability in the (right/left/two-sided) Cayley graph. The equivalence
classes then correspond to the strongly connected components. It is not
difficult to show that, in the worst case, the number of equivalence classes is
in the same order of magnitude as the number of elements. Another important
parameter is the maximal length of a chain of components. Our main contribution
is an exponential lower bound for this parameter. There is a simple
construction for an arbitrary set of generators. However, the proof for
constant alphabet is rather involved. Our results also apply to automata and
their syntactic semigroups.Comment: Full version of a paper submitted to CSR 2017 on 2016-12-1
On the Disambiguation of Weighted Automata
We present a disambiguation algorithm for weighted automata. The algorithm
admits two main stages: a pre-disambiguation stage followed by a transition
removal stage. We give a detailed description of the algorithm and the proof of
its correctness. The algorithm is not applicable to all weighted automata but
we prove sufficient conditions for its applicability in the case of the
tropical semiring by introducing the *weak twins property*. In particular, the
algorithm can be used with all acyclic weighted automata, relevant to
applications. While disambiguation can sometimes be achieved using
determinization, our disambiguation algorithm in some cases can return a result
that is exponentially smaller than any equivalent deterministic automaton. We
also present some empirical evidence of the space benefits of disambiguation
over determinization in speech recognition and machine translation
applications
On groups and counter automata
We study finitely generated groups whose word problems are accepted by
counter automata. We show that a group has word problem accepted by a blind
n-counter automaton in the sense of Greibach if and only if it is virtually
free abelian of rank n; this result, which answers a question of Gilman, is in
a very precise sense an abelian analogue of the Muller-Schupp theorem. More
generally, if G is a virtually abelian group then every group with word problem
recognised by a G-automaton is virtually abelian with growth class bounded
above by the growth class of G. We consider also other types of counter
automata.Comment: 18 page
Categorical Foundation of Quantum Mechanics and String Theory
The unification of Quantum Mechanics and General Relativity remains the
primary goal of Theoretical Physics, with string theory appearing as the only
plausible unifying scheme. In the present work, in a search of the conceptual
foundations of string theory, we analyze the relational logic developed by C.
S. Peirce in the late nineteenth century. The Peircean logic has the
mathematical structure of a category with the relation among two
individual terms and , serving as an arrow (or morphism). We
introduce a realization of the corresponding categorical algebra of
compositions, which naturally gives rise to the fundamental quantum laws, thus
indicating category theory as the foundation of Quantum Mechanics. The same
relational algebra generates a number of group structures, among them
. The group is embodied and realized by the matrix
models, themselves closely linked with string theory. It is suggested that
relational logic and in general category theory may provide a new paradigm,
within which to develop modern physical theories.Comment: To appear in International Journal of Modern Physics
Within-host competition between two entomopathogenic fungi and a granulovirus in Diatraea saccharalis (Lepidoptera: Crambidae).
Abstract: We provide insights into how the interactions of two entomopathogenic fungi and a virus play a role in virulence, disease development, and pathogen reproduction for an economically important insect crop pest, the sugarcane borer Diatraea saccharalis (Fabricius) (Lepidoptera: Crambidae). In our model system, we highlight the antagonistic effects of the co-inoculation of Beauveria bassiana and granulovirus (DisaGV) on virulence, compared to their single counterparts. By contrast, combinations of Metarhizium anisopliae and B. bassiana, or M. anisopliae and DisaGV, have resulted in additive effects against the insect. Intriguingly, most cadavers that were derived from dual or triple infections, produced signs/symptoms of only one species after the death of the infected host. In the combination of fungi and DisaGV, there was a trend where a higher proportion of viral infection bearing conspicuous symptoms occurred, except when the larvae were inoculated with M. anisopliae and DisaGV at the two highest inoculum rates. Co-infections with B. bassiana and M. anisopliae did not affect pathogen reproduction, since the sporulation from co-inoculated larvae did not differ from their single counterparts
Novel detected entomopathogenic fungus Pandora sp. infects Cacopsylla spp. and other phloem-feeding hemipteran insects
Conjugacy and Equivalence of Weighted Automata and Functional Transducers
International audienceWe show that two equivalent K-automata are conjugate to a third one, when K is equal to B, N, Z, or any (skew) ¯eld and that the same holds true for functional tranducers as well
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