Results 51 to 60 of about 80,814 (154)

Optimal Planar Electric Dipole Antenna

open access: yes, 2019
Considerable time is often spent optimizing antennas to meet specific design metrics. Rarely, however, are the resulting antenna designs compared to rigorous physical bounds on those metrics. Here we study the performance of optimized planar meander line
Capek, Miloslav   +6 more
core   +2 more sources

Companions of the fragments in the Jonsson enrichment

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы, 2017
In this article we consider the properties of central types for the existentially prime strongly convex Jonsson theories in some extension. This class of theories is a subclass of a broad class of Jonsson theories.
A.R. Yeshkeyev
doaj   +1 more source

Barriers in Quantum Gravity

open access: yes, 1993
I discuss recent progress in our understanding of two barriers in quantum gravity: $c > 1$ in the case of 2d quantum gravity and $D > 2$ in the case of Euclidean Einstein-Hilbert gravity formulated in space-time dimensions $D >2$.Comment: standard latex,
Ambjorn, Jan
core   +2 more sources

On the Kaiser Class of a Jonsson Theory

open access: yesSymmetry
This work introduces new tools to extend the research framework for Jonsson theories, which form a special subclass of inductive theories. Specifically, we introduce the concept of the Kaiser class and define a new equivalence relation for the study of Jonsson theories, which refines the relation of cosemanticness of the theories.
Aibat Yeshkeyev   +2 more
openaire   +1 more source

Model-theoretic properties of J-non-multidimensional theories

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы
The issues of utilizing the central type to analyze the theoretical and model properties of the idea of heredity were examined in this research, taking into account both theories and the Jonsson spectrum.
M.T. Kassymetova, G.E. Zhumabekova
doaj   +1 more source

Kite-marks, standards and privileged legal structures; artefacts of constraint disciplining structure choices [PDF]

open access: yes, 2019
As different countries and regions continue to develop policy and legal frameworks for social enterprises this paper offers new insights into the dynamics of legal structure choice by social entrepreneurs.
O'Dor, Jules
core  

On subdivision invariant actions for random surfaces

open access: yes, 1992
We consider a subdivision invariant action for dynamically triangulated random surfaces that was recently proposed (R.V. Ambartzumian et. al., Phys. Lett. B 275 (1992) 99) and show that it is unphysical: The grand canonical partition function is infinite
Ambartzumian   +15 more
core   +1 more source

Cubical coloring -- fractional covering by cuts and semidefinite programming

open access: yes, 2015
We introduce a new graph invariant that measures fractional covering of a graph by cuts. Besides being interesting in its own right, it is useful for study of homomorphisms and tension-continuous mappings.
Šámal, Robert
core   +2 more sources

The Alexandrov-Fenchel type inequalities, revisited

open access: yes, 2018
Various Alexandrov-Fenchel type inequalities have appeared and played important roles in convex geometry, matrix theory and complex algebraic geometry.
Li, Ping
core  

The properties of amalgamation and joint embedding in the meaning of positive Jonsson theories

open access: yesKazakh Mathematical Journal
In this paper, we study special subclasses of theories on the basis of the connection between the amalgamation property and the joint embedding property, as well as between the h-amalgamation property and the joint continuation property. Our results are presented in both the classical first-order logic and positive logic, which exhibit a parallel ...
Sultan Amanbekov   +2 more
openaire   +1 more source

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