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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
211

The reaction of the Quebec press to the American debate on the League of Nations

Burtt, Judith 25 April 2018 (has links)
Québec Université Laval, Bibliothèque 2012
212

Les voyages de James Wilson Morrice aux Caraïbes (1915-1924)

Carier, Christina 13 April 2018 (has links)
La présente recherche porte sur la vie et l'œuvre de James Wilson Morrice (Montréal, 10 août 1865 - Tunis, Tunisie, 23 janvier 1924), en attachant davantage une importance particulière aux voyages de l'artiste aux Antilles et aux Caraïbes (1915-1924), retracés à travers ses incomparables dessins, croquis, pochades, aquarelles et peintures à l'huile. En considérant les arrière-plans familial, artistique et formatif sur lesquels advinrent subséquemment la vie et l'œuvre du peintre, l'ensemble des facteurs dynamiques qui orientèrent l'action de Morrice vers de tels lieux, les événements typiques de la vie de l'homme lors de ces pérégrinations exotiques et le dossier complet des documents de travail produits pour une œuvre (notes, croquis, esquisses, pochades, etc.), le texte identifie le cheminement de sa vision et les mécanismes profonds du processus de conception de l'esthétique caraïbe de l'artiste. / The present research relates on James Wilson Morrice's (Montréal, August 10n , 1865 - Tunis, Tunisia, January 23rd , 1924) life and work, specifically on the journeys of the artist in the Antilles and to the Carribbean islands (1915-1924) explained through his incomparable drawings, sketches, watercolors and oil paintings. By considering the family, the artistic and the formatif backgrounds on which happened subsequently the painter's life and work, the dynamic factors which directed Morrice's action to such places, the typical events of the man's life during these exotic wanderings and the complete file of working documents produced for a work (notes, drawings, sketches, etc.), the text identifies the progress of his vision and the deep mechanisms of the artist's Caribbean aesthetics conception process.
213

A Survey of the Growth and Development of Extra-Curricular Activities in Woodrow Wilson High School 1929-1949

Cooper, Edith Roberts 08 1900 (has links)
This study of the extra-curricular activities of the Woodrow Wilson High School of Dallas, Texas, was made to determine who and why each of the activities developed, the life span of each, the percentage of the student body enrolled in the various groups, and the value of each extra-curricular activity from the viewpoint of the teachers, of the students, and of authorities in the field.
214

A study in scenic design for August Wilson's The Piano Lesson

Boles, William H. 01 January 2008 (has links)
This document is an illustrated journey of my process as scenic designer for August Wilson's The Piano Lesson. produced by the University of Central Florida’s Conservatory Theater Program. The production opened on November 8, 2007 in the Backbox theatre on the university's main campus and closed on November 18, running for a total of eight performances. I begin by examining my role as the scenic designer for The Piano Lesson and follow with an explanation of experiences that were a result of the assignment. Through this process, I present a script analysis of the play, describe the design process through conversations with the artistic team, present visual research and follow it through "the build" process, to its final presentation on the UCF stage. As a whole, this paper is a comment on the potential that theater has to bring different cultures together and how I, a twenty-two year old white male, could connect with August Wilson's play The Piano Lesson1 which is rooted in the African American culture. Race is a major component that I explore throughout my reflection of my experience with The Piano Lesson. This paper also documents personal experiences that I had as a direct result of working on The Piano Lesson at the University of Central Florida. I document winning the National Award for Scenic Design in 2008 from the Kennedy Center American College Theater Festival for my design. I also report about the summer I spent at the Eugene O'Neill Theater Center, where The Piano Lesson was originally work-shopped in 1986. Finally, I write about my visit to the Hill District in Pittsburgh, PA, where August Wilson grew up and where The Piano Lesson is set Each of these experiences are connected to my initial assignment at the University of Central Florida as scenic designer for August Wilson's, The Piano Lesson.
215

Laços de Wilson supersimétricos na correspondência AdS/CFT / Supersymmetric Wilson loops in the AdS/CFT correspondence

Kuraoka, Dhyan Victor Hiromitsu 29 May 2013 (has links)
O objetivo desta dissertação é revisar os operadores laços de Wilson no contexto da correspondência AdS/CFT. Estes operadores, presentes em qualquer teoria de calibre, são importantes por nos fornecer um parâmetro de ordem para a transição de fase confinante/desconfinante. Além disso, eles são particularmente importantes no estudo da correspondência AdS/ CFT pois: i) Eles nos dão, em alguns casos, resultados exatos graças ao fato de poderem ser localizados em um modelo de matrizes, desta forma nos permitindo fazer testes altamente não triviais da correspondência; ii) Eles são os objetos da teoria de calibre que são duais as cordas propagando no interior do espaço, nos dando um rico dicionário entre quantidades no interior (AdS) e na borda do espaço (CFT). Depois de revisarmos os laços de Wilson em teorias de calibre e a correspondência Ads/CFT, introduziremos a definição dos laços de Wilson supersimétricos 1/2 BPS. Calcularemos eles para o caso de um acoplamento fraco e para qualquer outro valor da constante de acoplamento usando técnicas de modelos de matrizes. Finalmente, compararemos nossos resultados com computações de superfícies minimais no interior do espaço, encontrando uma concordância perfeita. / The aim of this thesis is to review Wilson loop operators in the contexto f the AdS/CFT correspondence. These operators, wich are present in any gauge theory, are important because they furnish an order parameter for confinement/deconfinement phase transitions. Besides this, they are particularly relevant in the study of the AdS/CFT correspondence because: i) they allow, in some cases, for exact results thanks to localization to matrix models and make it possible to perform highly non-trivial tests of the correspondence; ii) they are the gauge theory objects dual to strings propagating in the bulk of the space and give a rich dictionary between bulk (AdS) and boundary (CFT) quantities. After reviews of Wilson loops in gauge theories and of the Ads/CFT correspondence, we will introduce the definition of 1/2 BPS supersymmetric Wilson loops, we will compute them at weak coupling and then at any order in the coupling constant via matrix model techniques, and finally we will compare our results with minimal surface computations in the bulk, finding perfect agreement.
216

Non-Hermitian polynomial hybrid Monte Carlo

Witzel, Oliver 22 September 2008 (has links)
In dieser Dissertation werden algorithmische Verbesserungen und Varianten für Simulationen der zwei-Flavor Gitter QCD mit dynamischen Fermionen studiert. Der O(a)-verbesserte Dirac-Wilson-Operator wird im Schrödinger Funktional mit einem Update des Hybrid Monte Carlo (HMC)-Typs verwendet. Sowohl der Hermitische als auch der nicht-Hermitische Operator werden betrachtet. Für den Hermitischen Dirac-Wilson-Operator untersuchen wir die Vorteile des symmetrischen gegenüber dem asymmetrischen Gerade-Ungerade-Präkonditionierens, wie man von einem mehr Zeitskalen-Integrator profitieren kann, sowie die Auswirkungen der kleinsten Eigenwerte auf die Stabilität des HMC Algorithmus. Im Fall des nicht-Hermitischen Operators leiten wir eine (semi)-analytische Schranke für das Spektrum her und zeigen eine Methode, um Informationen über den spektralen Rand zu gewinnen, indem wir komplexe Eigenwerte mit dem Lanczos-Algorithmus abschätzen. Diese spektralen Ränder erlauben es, Vorzüge des symmetrischen Gerade-Ungerade-Präkonditionierens oder den Effekt des Sheikholeslami-Wohlert-Terms für das Spektrum des nicht-Hermitischen Operators zu zeigen. Unter Verwendung der Informationen des spektralen Randes konstruieren wir angepasste, komplexe, skalierte und verschobene Tschebyschow Polynome zur Approximation des inversen Dirac-Wilson-Operators. Basierend auf diesen Polynomen entwickeln wir eine neue HMC-Variante, genannt nicht-Hermitischer polynomialer Hybrid Monte Carlo (NPHMC). Sie erlaubt, vom Importance Sampling unter Kompensation mit einem Gewichtungsfaktor abzuweichen. Zudem wird eine Erweiterung durch Anwendung des Hasenbusch-Tricks abgeleitet. Erste Größen der Leistungsfähigkeit, die die Abhängingkeit von den Eingabeparametern als auch einen Vergleich mit unserem Standard-HMC zeigen, werden präsentiert. Im Vergleich der beiden ein-Pseudofermion-Varianten ist der neue NPHMC etwas besser; eine eindeutige Aussage im Fall der zwei-Pseudofermion-Variante ist noch nicht möglich. / In this thesis algorithmic improvements and variants for two-flavor lattice QCD simulations with dynamical fermions are studied using the O(a)-improved Dirac-Wilson operator in the Schrödinger functional setup and employing a hybrid Monte Carlo-type (HMC) update. Both, the Hermitian and the Non-Hermitian operator are considered. For the Hermitian Dirac-Wilson operator we investigate the advantages of symmetric over asymmetric even-odd preconditioning, how to gain from multiple time scale integration as well as how the smallest eigenvalues affect the stability of the HMC algorithm. In case of the non-Hermitian operator we first derive (semi-)analytical bounds on the spectrum before demonstrating a method to obtain information on the spectral boundary by estimating complex eigenvalues with the Lanzcos algorithm. These spectral boundaries allow to visualize the advantage of symmetric even-odd preconditioning or the effect of the Sheikholeslami-Wohlert term on the spectrum of the non-Hermitian Dirac-Wilson operator. Taking advantage of the information of the spectral boundary we design best-suited, complex, scaled and translated Chebyshev polynomials to approximate the inverse Dirac-Wilson operator. Based on these polynomials we derive a new HMC variant, named non-Hermitian polynomial Hybrid Monte Carlo (NPHMC), which allows to deviate from importance sampling by compensation with a reweighting factor. Furthermore an extension employing the Hasenbusch-trick is derived. First performance figures showing the dependence on the input parameters as well as a comparison to our standard HMC are given. Comparing both algorithms with one pseudo-fermion, we find the new NPHMC to be slightly superior, whereas a clear statement for the two pseudo-fermion variants is yet not possible.
217

SO(3) Yang-Mills theory on the lattice

Barresi, Andrea 03 July 2003 (has links)
Das Verstaendnis dafuer, welche Freiheitsgrade fuer das Eingeschlossensein der Quarks von Bedeutung sind, ist ein altbekanntes Problem. Da weithin angenommen wird, dass das Zentrum der Eichgruppe eine bedeutende Rolle spielt, ist es interessant, eine Theorie mit einem trivialen Zentrum zu untersuchen. Das einfachste Modell, um dieses Problem zu untersuchen, ist eine Theorie mit ungeradzahliger Dimension der Darstellung der Eichgruppe SU(2). Theorien mit einem trivialen Zentrum werden schon seit langer Zeit in zwei verschiedenen Diskretisierungen untersucht: die adjungierte Wilson-Wirkung und die Villain-Wirkung. Es stellte sich heraus, dass sie aus zweierlei Gruenden problematisch sind. Zunaechst zeigte sich, dass in beiden Fällen ein bulk-Phasenuebergang den physikalischen Phasenuebergang bei endlicher Temperatur ueberschattet. Darueberhinaus erwies es sich im Falle der Villain-Theorie, dass die Anwesenheit von Twist-Sektoren fuer die Konstruktion eines ergodischen Algorithmus problematisch sein kann. Die Gitter-Artefakte, die den bulk-Phasenuebergang verursachen, wurden mit Z(2) Monopolen identifiziert. Diese Monopole koennen mit Hilfe eines entsprechenden chemischen Potentials unterdrueckt werden. Eine erste Untersuchung des Phasenuebergangs bei endlicher Temperatur durch andere Autoren wurde nur im Falle der Villain-Wirkung durchgefuehrt, wobei in dieser Untersuchung die Twist-Sektoren ohne Beruecksichtigung blieben. In der vorliegenden Arbeit untersuchen wir nichtstoerungstheoretisch die Wilson-Wirkung in der adjungierten Darstellung der Eichgruppe SU(2) mit einem chemischen Potential, welches die Z(2)-Monopole bei nicht verschwindender Temperatur und bei Temperatur Null unterdrueckt. Wir untersuchen hierbei die Auswirkungen des chemischen Potentials lambda auf einige Observable. Fuer hinreichend grosse lambda zeigen die Observablen keine Diskontinuitaet in der adjungierten Kopplung. In diesem Gebiet des Phasendiagramms untersuchen wir, meist eingeschraenkt auf den trivialen Twist-Sektor, die Existenz eines Phasenuebergangs bei endlicher Temperatur. Um diesen Phasenuebergang zu identifizieren, gelingt es uns, einen neuen Ordungsparameter zu definieren, den wir erfolgreich auch in der fundamentalen Darstellung der SU(2) testen. Ferner analysieren wir die raeumliche Verteilung der fundamentalen Polyakov-loop-Variable und des Pisaer Unordnungs-Operators, welcher die Kondensation magnetischer Ladungen beschreibt. Die Ergebnisse, die wir mit diesen Untersuchungsmethoden erhielten, lassen auf einen vom bulk-Phasenuebergang entkoppelten Phasenuebergang bei endlicher Temperatur oder einen cross-over schliessen. / The understanding of which degrees of freedom are relevant for the confinement of quarks is a long standing problem. Since it is widely believed that the center of the gauge group plays an important role, it is interesting to study a theory with a trivial center. The simplest model to investigate this problem is provided by a theory in an odd-dimensional representation of the gauge group SU(2). Center-blind theories were studied long time ago in two different discretizations, the adjoint Wilson and the Villain action, and they turned out to be problematic for two reasons. In both cases a bulk phase transition was shown to overshadow the physical finite temperature one. Another feature, pointed out in the Villain case, was the presence of twist sectors, which could cause difficulties in the construction of an ergodic algorithm. The lattice artifacts responsible for the bulk phase transition were identified with Z(2) monopoles and they could be suppressed by the use of an appropriate chemical potential. A preliminary investigation of the finite temperature phase transition by other authors was done only in the Villain case and without taking care of the twist sectors. In this thesis we perform a lattice study of the Wilson action in the adjoint representation of the gauge group SU(2) with a chemical potential, which suppresses the Z(2) monopoles at zero and non-zero temperature. We investigate the effects of the chemical potential lambda on some observables. For large enough lambda at vanishing temperature the observables do not show any discontinuity in the adjoint coupling. In this region we study the existence of a finite temperature phase transition restricting ourselves mainly to the trivial twist sector. In order to detect this phase transition we are able to define a new order parameter, which we successfully test also for the case of the fundamental representation of SU(2). Furthermore we analyze the spatial distribution of the fundamental Polyakov loop and the Pisa disorder operator which detects the condensation of magnetic charges. These different tools provide an indication for a finite temperature phase transition or crossover decoupled from the bulk phase transition.
218

Algorithmic studies of compact lattice QED with Wilson fermions

Zverev, Nikolai 18 December 2001 (has links)
Wir untersuchen numerisch und teilweise analytisch die kompakte Quantenelektrodynamik auf dem Gitter mit Wilson-Fermionen. Dabei konzentrieren wir uns auf zwei wesentliche Teilprobleme der Theorie: der Einfluss von Eichfeld-Moden mit verschwindendem Impuls in der Coulomb-Phase und die Effizienz von verschiedenen Monte-Carlo-Algorithmen unter Berücksichtigung dynamischer Fermionen. Wir zeigen, dass der Einfluss der Null-Impuls-Moden auf die eichabhängigen Gitter-Observablen wie Photon- und Fermion-Korrelatoren nahe der kritischen chiralen Grenzlinie innerhalb der Coulomb Phase zu einem Verhalten führt, das vom naiv erwarteten gitterstörungstheoretischen Verhalten abweicht. Diese Moden sind auch für die Abschirmung des kritischen Verhaltens der eichinvarianten Fermion-Observablen nahe der chiralen Grenzlinie verantwortlich. Eine Entfernung dieser Null-Impuls-Moden aus den Eichfeld-Konfigurationen führt innerhalb der Coulomb-Phase zum störungstheoretisch erwarteten Verhalten der eichabhängigen Observablen. Die kritischen Eigenschaften der eichinvarianten Fermion-Observablen in der Coulomb-Phase werden nach dem Beseitigen der Null-Impuls-Moden sichtbar. Der kritische Hopping-Parameter, den man aus den invarianten Fermion-Observablen erhält, stimmt gut mit demjenigen überein, der aus den eichabhängigen Observablen extrahiert werden kann. Wir führen den zweistufigen Multiboson-Algorithmus für numerische Untersuchungen im U(1)-Gittermodell mit einer geraden Anzahl von dynamischen Fermion-Flavour-Freiheitsgraden ein. Wir diskutieren die geeignete Wahl der technischen Parameter sowohl für den zweistufigen Multiboson-Algorithmus als auch für den hybriden Monte-Carlo-Algorithmus. Wir geben theoretische Abschätzungen für die Effizienz dieser Simulationsmethoden. Wir zeigen numerisch und theoretisch, daß der zweistufige Multiboson-Algorithmus eine gute Alternative darstellt und zumindestens mit der hybriden Monte-Carlo-Methode konkurrieren kann. Wir argumentieren, daß eine weitere Verbesserung der Effizienz des zweistufigen Multiboson-Algorithmus durch eine Vergrößerung der Zahl lokaler Update-Schleifen und auch durch die Reduktion der Ordnungen der ersten und zweiten Polynome zu Lasten des sogenannten 'Reweighting' erzielt werden kann. / We investigate numerically and in part analytically the compact lattice quantum electrodynamics with Wilson fermions. We studied the following particular tasks of the theory: the problem of the zero-momentum gauge field modes in the Coulomb phase and the performance of different Monte Carlo algorithms in the presence of dynamical fermions. We show that the influence of the zero-momentum modes on the gauge dependent lattice observables like photon and fermion correlators within the Coulomb phase leads to a behaviour of these observables different from standard perturbation theory. These modes are responsible also for the screening of the critical behaviour of the gauge invariant fermion values near the chiral limit line. Within the Coulomb phase the elimination of these zero-momentum modes from gauge configurations leads to the perturbatively expected behaviour of gauge dependent observables. The critical properties of gauge invariant fermion observables upon removing the zero-momentum modes are restored. The critical hopping-parameter obtained from the invariant fermion observables coincides with that extracted from gauge dependent values. We implement the two-step multiboson algorithm for numerical investigations in the U(1) lattice model with even dynamical Wilson fermion flavours. We discuss the scheme of an appropriate choice of technical parameters for both two-step multiboson and hybrid Monte Carlo algorithms. We give the theoretical estimates of the performance of such simulation methods. We show both numerically and theoretically that the two-step multiboson algorithm is a good alternative and at least competitive with the hybrid Monte Carlo method. We argue that an improvement of efficiency of the two-step multiboson algorithm can be achieved by increasing the number of local update sweeps and also by decreasing the orders of first and second polynomials corrected for by the reweighting step.
219

The Schrödinger functional for Gross-Neveu models

Leder, Björn 25 July 2007 (has links)
In dieser Arbeit werden Gross-Neveu Modelle mit einer endlichen Anzahl von Fermiontypen auf einem zweidimensionalen Euklidischen Raumzeitgitter betrachtet. Modelle dieses Typs sind asymptotisch frei und invariant unter einer chiralen Symmetrie. Aufgrund dieser Gemeinsamkeiten mit QCD sind sie sehr gut geeignet als Testumgebungen für Fermionwirkungen die in großangelegten Gitter-QCD-Rechnungen benutzt werden. Das Schrödinger Funktional für die Gross-Neveu Modelle wird definiert für Wilson und Ginsparg-Wilson Fermionen. In 1-Schleifenstörungstheorie wird seine Renormierbarkeit gezeigt. Die Vier-Fermionwechselwirkungen der Gross-Neveu Modelle habe dimensionslose Kopplungskonstanten in zwei Dimensionen. Die Symmetrieeigenschaften der Vier-Fermionwechselwirkungen und deren Beziehungen untereinander werden diskutiert. Im Fall von Wilson Fermionen ist die chirale Symmetrie explizit gebrochen und zusätzliche Terme müssen in die Wirkung aufgenommen werden. Die chirale Symmetrie wird durch das Einstellen der nackten Masse und einer der Kopplungen bis auf Cut-off-Effekte wiederhergestellt. Die kritische Masse und die symmetriewiederherstellende Kopplung werden bis zur zweiten Ordnung in Gitterstörungstheorie berechnet. Dieses Resultat wird in der 1-Schleifenberechnung der renormierten Kopplungen und der zugehörigen Betafunktionen benutzt. Die renormierten Kopplungen werden definiert mit Hilfe von geeignete Rand-Rand-Korrelatoren. Die Rechnung reproduziert die bekannten führenden Koeffizienten der Betafunktionen. Eine der Kopplungen hat eine verschwindende Betafunktion. Die Rechnung wird mit dem vor kurzem vorgeschlagenen Schrödinger Funktional mit exakter chiraler Symmetrie, also Ginsparg Wilson Fermionen, wiederholt. Es werden die gleichen Divergenzen gefunden, wie im Fall von Wilson Fermionen. Unter Benutzung des regularisierungsabhängigen, endlichen Teils der renormierten Kopplungen werden die Verhältnisse der Lambda-Parameter bestimmt. / Gross-Neveu type models with a finite number of fermion flavours are studied on a two-dimensional Euclidean space-time lattice. The models are asymptotically free and are invariant under a chiral symmetry. These similarities to QCD make them perfect benchmark systems for fermion actions used in large scale lattice QCD computations. The Schrödinger functional for the Gross-Neveu models is defined for both, Wilson and Ginsparg-Wilson fermions, and shown to be renormalisable in 1-loop lattice perturbation theory. In two dimensions four fermion interactions of the Gross-Neveu models have dimensionless coupling constants. The symmetry properties of the four fermion interaction terms and the relations among them are discussed. For Wilson fermions chiral symmetry is explicitly broken and additional terms must be included in the action. Chiral symmetry is restored up to cut-off effects by tuning the bare mass and one of the couplings. The critical mass and the symmetry restoring coupling are computed to second order in lattice perturbation theory. This result is used in the 1-loop computation of the renormalised couplings and the associated beta-functions. The renormalised couplings are defined in terms of suitable boundary-to-boundary correlation functions. In the computation the known first order coefficients of the beta-functions are reproduced. One of the couplings is found to have a vanishing beta-function. The calculation is repeated for the recently proposed Schrödinger functional with exact chiral symmetry, i.e. Ginsparg-Wilson fermions. The renormalisation pattern is found to be the same as in the Wilson case. Using the regularisation dependent finite part of the renormalised couplings, the ratio of the Lambda-parameters is computed.
220

From the Roman Republic to the American Revolution : readings of Cicero in the political thought of James Wilson

Wilson, Laurie Ann January 2010 (has links)
As a classical scholar and prominent founding father, James Wilson was at once statesman, judge, and political thinker, who read Cicero as an example worthy of emulation and as a philosopher whose theory could be applied to his own age. Classical reception studies have focused on questions of liberty, civic virtue, and constitutionalism in the American founding, and historians have also noted Wilson’s importance in American history and thought. Wilson’s direct engagement with Cicero’s works, however, and their significance in the formulation of his own philosophy has been long overlooked. My thesis argues that Wilson’s viewpoint was largely based on his readings of Cicero and can only be properly understood within this context. In the first two chapters of my thesis I demonstrate that Wilson not only possessed a wide-ranging knowledge of the classics in general, but also that he borrowed from Cicero’s writings and directly engaged with the texts themselves. Building upon this foundation, chapters three and four examine Cicero’s perspective on popular sovereignty and civic virtue, situate Wilson’s interpretations within contemporary discussions of Roman politics, and analyse the main ways in which he adapts Cicero’s arguments to his own era. Wilson retains a broader faith in the common people than seen in Cicero’s opinions, and he abstracts from Cicero a doctrine of sovereignty as an indivisible principle that is absent in the text; nevertheless, Cicero’s conception of a legitimate state and his insistence on the role of the people provided the foundation for Wilson’s thought and ultimately for his legitimization of the American Revolution. At the same time, like Cicero, Wilson views the stability of the state as resting in the personal virtue of the individual. While his enlightenment philosophy imparts optimism to his conception of the good citizen, his definition of virtue closely follows that of Cicero. As the final chapter of my thesis concludes, their individual interpretations of these theories of popular consent and virtue were instrumental in forming Cicero’s and Wilson’s justifications of civil disobedience.

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