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causal asymmetry

Overview page. Subjects: Philosophy.

Causation seems to be an anti symmetrical relation, meaning that if an event a is a cause of another event b, then b is not also a cause of a. ...

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linearity

Overview page. Subjects: Economics.

A feature of certain kinds of derivatives such as forwards, futures, and swaps where the payoff has a linear relation to the underlying. Also called symmetrical since the gains and ...

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equivalence relation

Edited by Andrew Butterfield, Gerard Ekembe Ngondi and Anne Kerr.

in A Dictionary of Computer Science

January 2016; p ublished online January 2016 .

Reference Entry. Subjects: Computing. 50 words.

A *relation that is *transitive, *symmetric, and *reflexive. The concept is a convenient generalization or abstraction of equality. It covers most notions of equals, equivalence, and...

non-symmetric

Overview page. Subjects: Mathematics.

(of a relation)

Not symmetric, or asymmetric, or antisymmetric. The relation has to hold for some pairs in both orders, and hold for only one order for some other pairs, i.e. there...

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Combinatorial Hopf Algebras and K-Homology of Grassmanians

Thomas Lam and Pavlo Pylyavskyy.

in International Mathematics Research Notices

January 2007; p ublished online January 2007 .

Journal Article. Subjects: Mathematics; Pure Mathematics. 0 words.

Motivated by work of Buch on set-valued tableaux in relation to the K-theory of the Grassmannian, we study six combinatorial Hopf algebras. These Hopf algebras can be thought of as K-theore...

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equivalence relation

Overview page. Subjects: Mathematics — Philosophy.

A relation that is transitive, symmetric, and reflexive. The concept is a convenient generalization or abstraction of equality. It covers most notions of equals, equivalence, and similarity...

See overview in Oxford Index

On Indistinguishability and Prototypes

Konstantinos Georgatos.

in Logic Journal of the IGPL

September 2003; p ublished online September 2003 .

Journal Article. Subjects: Logic. 0 words.

Tolerance spaces are sets equipped with a reflexive, symmetric, but not necessarily transitive, relation of indistinguishability, and are useful for describing vagueness based on error-prone...

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Bound states in spherically symmetric potentials

Efstratios Manousakis.

in Practical Quantum Mechanics

November 2015; p ublished online December 2015 .

Chapter. Subjects: Atomic, Molecular, and Optical Physics. 4763 words.

This chapter deals with bound states in the case where the potential is spherically symmetric. As a result, it discusses the spherical Bessel equation, the spherical Bessel and Newmann...

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Rhytidectomy Approach for Recurrent Madelung Disease

Michele Di Candia and George C. Cormack.

in Aesthetic Surgery Journal

August 2011; p ublished online August 2011 .

Journal Article. 1954 words.

Benign symmetrical lipomatosis (Madelung disease) is a rare metabolic disorder characterized by the presence of multiple, symmetric, nonencapsulated fat masses in the face, neck, and...

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Mixing Angle between 3 P 1 and 1 P 1 in HQET

Takayuki Matsuki, Toshiyuki Morii and Koichi Seo.

in Progress of Theoretical Physics

August 2010; p ublished online August 2010 .

Journal Article. Subjects: Nuclear Physics; Particles and Fields. 0 words.

Some claim that there are two independent mixing angles (θ = 35.3°, −54.7°) between 3 P 1 and 1 P 1 states of heavy-light mesons in the heavy...

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Symmetry

Peter John Glanville.

in The Lexical Semantics of the Arabic Verb

May 2018; p ublished online May 2018 .

Chapter. Subjects: Grammar, Syntax and Morphology; Linguistics. 12005 words.

Chapter 5 determines the semantic typology of patterns III and VI, sometimes termed the vowel-lengthening patterns. It asserts that verbs formed in these patterns are symmetrical...

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Symmetric Dependence

Elizabeth Barnes.

in Reality and its Structure

May 2018; p ublished online June 2018 .

Chapter. Subjects: Metaphysics. 10010 words.

Metaphysical orthodoxy maintains that the relation of ontological dependence is irreflexive, asymmetric, and transitive. The goal of this paper is to challenge that orthodoxy by arguing...

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Symmetric Periodic Orbits and Topological Entropy in the Two-Dimensional Cubic Map

Yoshihiro Yamaguchi and Kiyotaka Tanikawa.

in Progress of Theoretical Physics

December 2005; p ublished online December 2005 .

Journal Article. 0 words.

We show that a three-fold horseshoe appears in the doubly reversible two-dimensional cubic map including one parameter, a. It is found that the lower bound of the topological entropy hnull...

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Non-Birkhoff Periodic Orbits of Farey Type and Dynamical Ordering in the Standard Mapping. II

Yoshihiro Yamaguchi and Kiyotaka Tanikawa.

in Progress of Theoretical Physics

October 2007; p ublished online October 2007 .

Journal Article. 0 words.

Using dynamical ordering for symmetric non-Birkhoff periodic orbits of Farey type (NBF), the properties of the limit at which the rotation numbers of NBFs accumulate to a rational number or...

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THE COHOMOLOGY OF THE BRAID GROUP B 3 AND OF SL2(ℤ) WITH COEFFICIENTS IN A GEOMETRIC REPRESENTATION

F. Callegaro, F. R. Cohen and M. Salvetti.

in The Quarterly Journal of Mathematics

September 2013; p ublished online June 2013 .

Journal Article. Subjects: Pure Mathematics. 0 words.

The purpose of this article is to describe the integral cohomology of the braid group B 3 and SL2(ℤ) with local coefficients in a classical geometric representation given by...

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Could There Be Unicorns?

Michael Dummett.

in The Seas of Language

February 1996; p ublished online November 2003 .

Chapter. Subjects: Philosophy of Language. 10947 words.

Kripke argued that there might not have been unicorns: since unicorns are fictional species, they are necessarily fictional. There are three arguments aimed at showing the fictionality of...

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Building II

Karen Bennett.

in Making Things Up

May 2017; p ublished online June 2017 .

Chapter. Subjects: Metaphysics. 17520 words.

This chapter argues for a particular way of characterizing what it takes for a relation to count as a building relation. All building relations are a) asymmetric and irreflexive, b)...

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Causal Relations

John Heil.

in The Metaphysics of Relations

January 2016; p ublished online December 2015 .

Chapter. Subjects: Metaphysics. 4555 words.

In this chapter the received view of causation, according to which causal relations are a distinctive species of external relation, and causal relata are taken to be pairs of events, the...

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Black-Hole Winds with a Variable Eddington Factor

Chizuru Akizuki and Jun Fukue.

in Publications of the Astronomical Society of Japan

June 2009; p ublished online June 2009 .

Journal Article. Subjects: Astrometry and Celestial Mechanics; Stars. 3508 words.

We solve one-dimentinal spherically symmetric, optically thick black-hole winds under general relativity with the help of a variable Eddington factor, [math]([math], [math]), where [math]...

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Spherical Relativistic Radiation Flows with Variable Eddington Factor

Chizuru Akizuki and Jun Fukue.

in Publications of the Astronomical Society of Japan

April 2008; p ublished online April 2008 .

Journal Article. Subjects: Astrometry and Celestial Mechanics; Stars. 4721 words.

We solve spherically symmetric radiation flows under full special relativity with the help of a variable Eddington factor, [math], where [math] is the optical depth and [math] is the flow...

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