It is near-consensus among those currently working on the semantics of counterfactuals that the correct treatment of counterfactuals (whatever it is) must invoke causal independence in order to rule a particular set of seemingly true counterfactuals – including a famous one called Morgenbesser's Coin (MC) – true. But if we must analyze counterfactuals in terms of causation, this rules out giving a reductive account of causation in terms of counterfactuals, and is, as such, a serious blow to the Humean hope of reducing causation to counterfactual dependence. This dissertation is composed of three self-standing articles. In the first article I argue that counterfactuals like MC are false contrary to appearances; as is the thesis that the correct semantics of counterfactuals must appeal to causal independence. In the second article I argue that there are important, widely-held assumptions about difference-making and its relationship to causation which are false, and which may underlie some of the remaining, most threatening objections to the counterfactual analysis of causation. In the final article I discuss the puzzle of reverse Sobel sequences – an alleged problem for the classic Lewis-Stalnaker semantics for counterfactuals. I argue that none of the extant approaches to the problem are right, and defend a novel solution to the puzzle. If I am correct, reverse Sobel sequences do not threaten the classic analysis. They do, however, give additional evidence for the thesis, forcefully defended by Alan Hájek, that most non-probabilistic 'would'-counterfactuals are false. This motivates placing a stronger emphasis on trying to understand probabilistic counterfactuals first and foremost.

Ph.D. (Chemistry) / The bridged chiral benzopyrans were strategically ring opened via acetolysis to yield either galactose based chromenes or chromans, depending on the reaction conditions. A proposal relating to the mechanism of this selective ring opening acetolysis is discussed. The benzopyrans (chromenes, chromans and bridged chiral benzopyrans) were de-acetylated via triethyl amine catalysed transesterification. Interestingly, the chromenes did not yield the anticipated hydrolysis product (triol) but a new class of bridged chiral benzopyrans which were a result of intramolecular oxa-Michael addition. A chromene that formed during the selective ring opening of the bridged chiral benzopyrans was employed to develop a method for the synthesis of a carbohydrate derived oxepane. The oxepane synthesis was achieved, albeit in the face of numerous challenges from side reactions. The difficulties encountered in the synthesis are discussed...

Ph.D. / The research described in this thesis was directed at advancing the application of metal triflates, Al(OTf)3 in particular, in organic synthesis, on the one hand and to contribute to the understanding of the underlying basis for their catalytic activity. The study was undertaken against the background and on the bases of a detailed literature study of metal triflates, their chemical and catalytic properties and applications thereof. Amongst others, it deals with the possible role of metal-bound water that give rise to Brønsted type acidity and that this induced Brønsted acidity may be responsible for the catalytic activity that is observed. The study was prompted by the realisation that Al(OTf)3 was largely neglected as a potential reusable catalyst. This is in marked contrast to the attention paid to other metal triflates, the rare earth metals in particular. Earlier work in this laboratory has shown that Al(OTf)3 is stable in water from which it can be recovered easily for reuse. In addition it showed promise as a Lewis acid catalyst and is relatively soluble in several organic solvents. New applications for the use of Al(OTf)3 have now been demonstrated. These include the efficient formation of acetals from aldehydes and ketones. The conversions can be carried out in an alcohol/orthoester mixture or preferably in neat orthoester. Other metal triflates, notably Sc(OTf)3 and In(OTf)3, are useful alternative catalysts. Al(OTf)3 can be easily recycled without loss of activity. This methodology also can be applied to aldehydes and ketones containing TBDMS groups without effecting deprotection of the ethers. In view of the sensitivity of the TBDMS groups to hydrolysis in the presence of triflic acid the results suggest little hydrolysis (or alcoholysis) of the metal triflates in the protic solvents used, which would generate trifluoromethanesulfonic acid as a consequence of such metal based hydrolysis. Al(OTf)3 was also found to be a good catalyst for the formation of THP ethers. It proved to be excellent for Friedel Crafts reactions using alkynes as substrates. Al(OTf)3 together with other triflates offers a mild alternative to the more traditional water sensitive Lewis acids, e.g. BF3, AlCl3 and TiCl4, which are difficult to recover and require the use of extremely dry solvents.

In his paper, The Paradoxes of Time Travel, David Lewis posits a defense for the possibility of time travel by arguing that the grandfather 'paradox' is not, in fact, paradoxical at all. Two alternative solutions to the grandfather paradox are discussed in this paper. The first is a result of Paul Horwich’s reply to Lewis and aims to pit the Lewisian conception of compatibility against Horwich’s improbability defense. Proposed by Nicholas Smith and C.G. Goddu, this theory explains that any attempt at backward time travel will lead to the creation of long strings of improbable coincidences. An alternative thesis of the multiverse is also discussed, wherein it was proposed that instead of traveling into his past, the time traveler enters an alternate, yet completely identical universe. The multiverse thesis did not stand up to any philosophical critique, and it was posited that the thesis changes the nature of the question entirely. It is evident that Lewis’ discussion of the grandfather paradox raises several fundamentally interesting philosophical questions regarding the logical and causal irregularities of changing the past. This paper aims to adress some of these questions through a metaphysical analysis of Lewis' view, backwards causality, and the nature of time itself.

A descriptive and critical account of the theory of valuation presented by C.I. Lewis in An Analysis of Knowledge and Valuation. Both the a priori and empirical basis for the theory are examined. The essential weakness of the theory lies in an inability to overcome some of the criticisms of the emotivists, especially in the concept of the ultimately valuable. Hence Lewis in unable, even, to present a view as plausible as the emotivists in that his theory of evaluation is, for all practical purposes, a tautology. In order to overcome this difficulty Lewis must hypostatize some non-empirical property or some imperative. However, Lewis has presented the most comprehensive and analytic defense of a naturalistic system since the appearance of Perry's Interest Theory. Many of the value concepts are analyzed showing the development and structure of Lewis' theory. / Arts, Faculty of / Philosophy, Department of / Graduate

Cette thèse étudie les récits de voyage dans l’imaginaire et les croisements entre divers contes et histoires, des éléments de plus en plus présents dans la littérature pour la jeunesse comme au cinéma. Quoiqu’il semble récent, ce type de récits existe, en fait, depuis longtemps. En nous intéressant à un corpus qui traverse différentes époques, nous cherchons à voir comment se construisent ces textes qui, comme dans Alice au pays des merveilles dont ils s’inspirent, transportent le personnage et le lecteur dans un monde merveilleux. Notre corpus se compose d’Alice au pays des merveilles (1865) et De l’autre côté du miroir (1871) de Lewis Carroll, de Sur les ailes de l’Oiseau bleu : l’envolée féerique et Une Révolte au pays des fées (1936) de Marie-Claire Dalevuy, de La bibliothécaire (1995) de Gudule et de l’album Il était une fois au pays des contes (2009) de Delphine Godard et Claire Degans. En observant les jeux de référence entre l’histoire principale et les fictions antérieures, nous examinons les liens entre les mondes fictionnels qui surgissent dans l’aventure et entre les différents textes évoqués (transfictionnalité et intertextualité). Nous nous intéressons également aux objectifs visés par ces textes qui proposent une initiation à la littérature et à la lecture littéraire.

A model examining underground smouldering peat combustion is presented. A one-step chemical reaction is considered where the gas and solid are assumed to be in thermal equilibrium. The full model allows porosity, permeability and gas density to vary and considers a buoyant velocity field determined by Darcy's law. Due to the low bulk thermal conductivity of peat, the diffusion of oxygen through it is characterised by a Lewis number much less than one. This results in thermal-diffusive instabilities. These instabilities can cause flame balls to arise in gaseous combustion and a fingering regime to arise in solid combustion. Analytical solutions to simplified spherically symmetrical equations are derived. These equations assume diffusion to be the dominant transport mechanism as well as taking that the porosity, gas molecular weight and gas density all remain constant. The underlying structure of the combustion region is found to be analogous to that of a flame ball. When studied in cylindrical symmetry a single, stable finger can be modelled propagating against an imposed air flow. The effects of heat losses, velocity magnitude and the Lewis number can be studied and results are compared to existing experimental smouldering combustion data. Although no detailed experiments have studied this phenomenon in peat, predicted results capture key qualitative trends found in both filtration combustion of polyurethane foam and in the fingering combustion of paper. In addition to this, when the imposed air flow is reduced to zero a propagating combustion front is predicted, analogous to a self-travelling flame ball. When the velocity field is determined by Darcy's law the dimensionless permeability of the peat plays a key role in determining the range of values over which fingering combustion can occur. Whilst there is little impact of taking the gas molecular weight to be constant, when porosity is allowed to vary and a relationship between porosity and permeability is included an over-blowing extinction limit is identified. This limit is not found in the constant-porosity model where a low-fuel extinction limit is predicted. Peats of differing ages and locations can possess significantly different characteristics. However, the fingering regime is predicted to occur within the range of parameters in which peat soils lie. Experiments suggest that fingering combustion can take the form of both sparse fingers and a complex fingering regime. The cylindrically symmetrical model can not capture tip-splitting. Hence the model does not explicitly account for the distance between two neighbouring fingers. However, an estimate for this value can be made if peat smouldering were to occur in a regime of multiple fingering. An averaged continuum model describing the spread of an ember storm is also presented. The dominant mechanism determining the spread-rate of the fire is the lofting and landing of embers and individual fires are taken to grow in an elliptical manner under the influence of the wind. When an ember storm is spreading at a steady speed, its spread rate is found to be described by a single similarity solution.

In the Apostolic Faith Mission of South Africa (AFM) there is a school of thought, which has a very simplistic viewpoint of the role of the Evil One in the suffering in this world. Satan is seen as a very definite adversary who has to be resisted by rebuke and positive confession of the promises in the Bible in order for man to have a life free of any suffering. The consequence of the extreme dualistic perspective is that Satan is regarded as an independent entity. Man, as God’s representative, is the one with the authority and responsibility to thwart the efforts of Satan to cause suffering in the world. All suffering is the result of the direct onslaught of Satan. The Bible paints a different picture in both Testaments. Satan is a rebel, but still a creature subjected to the supremacy of God. There is also no preoccupation with Satan. He is an elusive foe, focusing his subtle attacks on the relationship between God and man. The Old Testament shows his subtle and illusive nature by using images of human enemies, mythical monsters and the threat of death. The believer of both Testaments resists him by living a Godfocused life. The life and works of C.S. Lewis have been pivotal in changing the perspective of the writer of this dissertation. Lewis shows that God is using suffering as a scalpel as it were, to cut out the infection caused by evil contamination in the heart of man. Until the Kingdom of God finally arrives in fullness, this will be the situation. Suffering has not only one role-player. The situation is more often than not of a very complex and mysterious nature. It is suggested that the simplistic school of thought take notice of the insights of Lewis. This study has shown that the simplistic school of thought in the AFM lacks the depth and balance found in the Bible and ingeniously expounded by C.S. Lewis. / Dr. LP Mare

京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第22454号 / 工博第4715号 / 新制||工||1736(附属図書館) / 京都大学大学院工学研究科材料化学専攻 / (主査)教授 松原 誠二郎, 教授 杉野目 道紀, 教授 中尾 佳亮 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM

Thesis advisor: Masayuki Wasa / Thesis advisor: Amir H. Hoveyda / This dissertation describes the development of cooperative catalyst systems that contain an achiral Lewis acid and a chiral Lewis acid that may have overlapping functions but play their independent roles to promote enantioselective C–C bond formations. Chapter 1 provides a summary of recent advances made in the field of enantioselective cooperative catalysis that served as intellectual foundations for this dissertation research. As it will be discussed in the first chapter, key limitations of cooperative catalysis are: (1) undesirable catalyst deactivation which occurs due to acid/base complexation, (2) requirement for base sensitive pronucleophiles and acid sensitive electrophiles, and (3) poor reaction efficiency. In an effort to overcome these fundamental limitations, we have developed “frustrated” Lewis pair (FLP)-based catalyst systems that consist of potent and sterically encumbered Lewis acids used in pair with bulky N-containing Lewis bases. To demonstrate the potential of the novel FLP catalyst system, we describe our work involving the enantioselective Conia-ene-type cyclization (Chapter 2). In the subsequent chapter (Chapter 3), we discuss the application of the FLP catalysts for enantioselective β-amino C–H functionalization reactions. / Thesis (PhD) — Boston College, 2021. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Chemistry.