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1.
Claims that necessary and sufficient conditions are not converse relations are discussed, as well as the related claim that If A, then B is not equivalent to A only if B. The analysis of alleged counterexamples has shown, among other things, how necessary and sufficient conditions should be understood, especially in the case of causal conditions, and the importance of distinguishing sufficient-cause conditionals from necessary-cause conditionals. It is concluded that necessary and sufficient conditions, adequately interpreted, are converse relations in all cases.  相似文献   

2.
Davey  Kevin 《Studia Logica》2002,72(3):339-362
In this paper, we consider two different ways in which modus-ponens type reasoning with conditional obligations may be formalized. We develop necessary and sufficient conditions for the validity of each, and make some philosophical observations about the differences between the minor premises that each formalization requires. All this is done within the context of the Belnap-Perloff stit theory.  相似文献   

3.
The German physicist Heinrich Hertz played a decisive role for Wittgenstein's use of a unique philosophical method. Wittgenstein applied this method successfully to critical problems in logic and mathematics throughout his life. Logical paradoxes and foundational problems including those of mathematics were seen as pseudo-problems requiring clarity instead of solution. In effect, Wittgenstein's controversial response to David Hilbert and Kurt Gödel was deeply influenced by Hertz and can only be fully understood when seen in this context. To comprehend the arguments against the metamathematical programme, and to appreciate how profoundly the philosophical method employed actually shaped the content of Wittgenstein's philosophy, it is necessary to make an intellectual biographical reconstruction of their philosophical framework, tracing the Hertzian elements in the early as well as in the later writings. In order to write Wittgenstein's biography, we have to take seriously the coherence of his thought throughout his life, and not let convenient philosophical ideologies be our guidance in drawing up a “Wittgensteinian philosophy”. To do so, we have to take a second look upon what he actually wrote, not only in the already published material, but in the entire Nachlass. Clearly, this is not easily done, but it is a necessary task in the historical reconstruction of Wittgenstein's life and work.  相似文献   

4.
Newton Garver 《Topoi》1991,10(2):187-198
Conclusion In previous essays (1973, 1975, 1977) I have praised Derrida's contributions to philosophical dialogue and also insisted on their limitations. The considerations raised in this present essay do not lead me to a position that is less ambivalent.Philosophy is a particular language-game. Like any other, it has its constitutive rules; or, perhaps better: its practice has certain distinctive features by means of which we recognize philosophizing and distinguish it from other linguistic activities. None of this can be set down in the form of necessary and sufficient conditions, and there always will be large areas of controversy about the paradigms themselves. Nonetheless there are philosophers, and they generally acknowledge Plato, Aristotle, Leibniz, Hume, and even some of their colleagues as also being philosophers. This acknowledgement holds even where there is philosophical disagreement - as must inevitably be the case, in view of the dialogical character of philosophical discourse.Derrida occasionally enters into the dialogue, as do many others - poets, novelists, critics, diplomats, attorneys, cooks, barbers, and babysitters. These occasional contributions to philosophical dialogue differ in focus, in style, and in lack of self-referentiality from the works which constitute the main corpus of philosophy. Some might wish to say, as if the matter were paradoxical, that such contributions are both philosophical and not philosophical, or that they are neither philosophy nor not-philosophy. That might be as good a thing to say as anything. The practice of philosophy is complex and has many levels. Those who are acknowledged as its finest practitioners have a focus, a style, and a respect for where questions begin and end. Derrida does not share these qualities, and does not care to share them. That is no reason to ignore his work, but it is sufficient to explain why philosophers do not recognize it as a contribution to the central corpus of philosophy.  相似文献   

5.
Often coherentism is taken to be the view that justification is solely a function of the coherence among a person's beliefs. I offer a counterexample to the idea that when so understood coherence is sufficient for justification. I then argue that the counterexample will still work if coherence is understood as coherence among a person's beliefs and experiences. I defend a form of nondoxastic foundationalism that takes sensations and philosophical intuitions as basic and sees nearly all other justification as depending on inference to the best explanation. I take up Wilfrid Sellars's Dilemma, which starts with the idea that the foundations must be either propositional in nature or not. The argument continues: if they are, they stand in need of justification; if they are not, they cannot confer justification. It concludes that there cannot be foundations that confer justification on other beliefs. I deny both horns of this dilemma, arguing that philosophical intuitions are propositional but do not stand in need of justification and that sensations are not propositional but can confer justification on perceptual beliefs.  相似文献   

6.
Standard biological and philosophical treatments assume that dramatic genotypic or phenotypic change constitutes instantaneous speciation, and that barring such saltation, speciation is gradual evolutionary change in individual properties. Both propositions appear to be incongruent with standard theoretical perspectives on species themselves, since these perspectives are (a) non‐pheneticist, and (b) tend to disregard intermediate cases. After reviewing certain key elements of such perspectives, it is proposed that species‐membership is mediated by membership in a population. Species‐membership depends, therefore, not on intrinsic characteristics of an organism, but on relationship of an organism to others. A new definition of speciation is proposed in the spirit of this proposal. This definition implies that dramatic change is neither necessary nor sufficient for speciation. It also implies, surprisingly, that an organism can change species during its lifetime.  相似文献   

7.
Clinicians sometimes disagree about how much to honor surrogates’ deeply held cultural values or traditions when they differ from those of the host country. Such a controversy arose when parents requested a cultural accommodation to let their infant die by withdrawing life saving care. While both the parents and clinicians claimed to be using the Best Interests Standard to decide what to do, they were at an impasse. This standard is analyzed into three necessary and jointly sufficient conditions and used to resolve the question of how much to accommodate cultural preferences and how to treat this infant. The extreme versions of absolutism and relativism are rejected. Properly understood, the Best Interests Standard can serve as a powerful tool in settling disputes about how to make good decisions for those who cannot decide for themselves.  相似文献   

8.
Peirce makes it clear that doubt and belief oppose one another. But that slogan admits of a weaker and a stronger reading. The weaker reading permits and the stronger reading forbids one to be in a state of doubt and of belief with respect to the same proposition at the same time. The stronger claim is standardly attributed to Peirce, for textual and philosophical reasons. This paper maintains that this standard construal is excessively strong. It argues that the secondary literature tends to presuppose the strong reading and that it often does so by confusing sufficient conditions for belief with necessary ones. It acknowledges some textual evidence on behalf of the strong reading but maintains that, taken as a whole, the relevant passages are as friendly to the weak as to the strong interpretation of Peirce. The paper then links the doubt–belief theory of “The Fixation of Belief” to the papers on probability that occupy the bulk of the Illustrations of the Logic of Science. It shows that Peirce's discussion of probability, strength of belief, and weight of evidence makes room for confidence, but not belief, to be undermined and thus offers a more flexible version of Peirce's theory of inquiry.  相似文献   

9.
When we hope to explain and perhaps vindicate a practice that is internally diverse, philosophy faces a methodological challenge. Such subject matters are likely to have explanatorily basic features that are not necessary conditions. This prompts a move away from analysis to some other kind of philosophical explanation. This paper proposes a paradigm based explanation of one such subject matter: blame. First, a paradigm form of blame is identified—‘Communicative Blame’—where this is understood as a candidate for an explanatorily basic form of blame. Second, its point and purpose in our lives is investigated and found to reside in its power to increase the alignment of the blamer and the wrongdoer's moral understandings. Third, the hypothesis that Communicative Blame is an explanatorily basic form of blame is tested out by seeing how far other kinds of blame can reasonably be understood as derivative, especially in respect of blame's point and purpose. Finally, a new and quasi‐political worry about blame is raised.  相似文献   

10.
The inverse base rate effect (IBRE) continues to be a puzzling case of decision making on the basis of conflicting information in human category learning. After being trained via feedback over trials to assign combinations of cues to high- and low-frequency categories, participants tend to respond with the low-frequency category to an otherwise perfectly conflicting pair of test cues, contrary to the category base rates. Our Experiment 1 demonstrated that decision making on the basis of an explicit summary of the cue-outcome and outcome base rate information from the standard learning task does not result in the effect. The remaining experimental conditions evaluated the necessary and sufficient conditions for the effect by systematically exploring experimental deviations between the standard learning task and the pure decision-making task. In partial disagreement with both recent theoretical accounts of the effect, these experiments indicate that asymmetric outcome representation and profound base rate neglect are individually necessary and jointly sufficient conditions. Broader theoretical implications are discussed.  相似文献   

11.
This article offers an overview of philosophical methodologies. In an attempt to avoid a certain circularity, the article itself tries to avoid consciously or solely deploying and engaging with any current standard notion of what constitutes a philosophical method or philosophy itself. It hopes to find some of the possible places in which philosophy occurs, and this turns out to include (at least) such endeavours as literature, art, poetry, and linguistics. From here it considers how almost anything—for example, conversation, everyday life, and love—can also be philosophy. An attempt is made to identify some characteristic feature of philosophy as it occurs in all such forms. In the end, the simultaneous enacting of a peculiar optimism and particular humility both, in the search for knowledge, is put forward as potentially sufficient to at least begin to identify philosophy across its many guises.  相似文献   

12.
R.?GrayEmail author 《Synthese》2005,147(3):461-475
Keeley has recently argued that the philosophical issue of how to analyse the concept of a sense can usefully be addressed by considering how scientists, and more specifically neuroethologists, classify the senses. After briefly outlining his proposal, which is based on the application of an ordered set of individually necessary and jointly sufficient conditions for modality differentiation, I argue, by way of two complementary counterexamples, that it fails to account fully for the way the senses are in fact individuated in neuroethology and other relevant sciences. I suggest substantial modifications to Keeley’s account which would both solve the problem cases and make better sense of the actual classifications made by scientists. I conclude by noting some limits to the way of classifying the senses that I suggest. I conclude by suggesting that the problem I identify in Keeley’s account has arisen from a confusion that sometimes arises in the philosophical literature between how we individuate the senses and what constitutes a sense.  相似文献   

13.
Eugen Fischer 《Synthese》2008,162(1):53-84
The later Wittgenstein advanced a revolutionary but puzzling conception of how philosophy ought to be practised: Philosophical problems are not to be coped with by establishing substantive claims or devising explanations or theories. Instead, philosophical questions ought to be treated ‘like an illness’. Even though this ‘non-cognitivism’ about philosophy has become a focus of debate, the specifically ‘therapeutic’ aims and ‘non-theoretical’ methods constitutive of it remain ill understood. They are motivated by Wittgenstein’s view that the problems he addresses result from misinterpretation, driven by ‘urges to misunderstand’. The present paper clarifies this neglected concept and analyses how such ‘urges’ give rise to pseudo-problems of one particular, hitherto little understood, kind. This will reveal ‘therapeutic’ aims reasonable and ‘non-theoretical’ methods necessary, in one clearly delineated and important part of philosophy. I.e.: By developing a novel account of nature and genesis of one important class of philosophical problems, the paper explains and vindicates a revolutionary reorientation of philosophical work, at the level of both aims and methods.  相似文献   

14.
Lin Ma  Jaap van Brakel 《Dao》2013,12(3):297-312
In this essay, we present a theory of intercultural philosophical dialogue and comparative philosophy, drawing on both hermeneutics and analytic philosophy. We advocate the approach of “de-essentialization” across the board. It is true that similarities and differences are always to be observed across languages and traditions, but there exist no immutable cores or essences. “De-essentialization” applies to all “levels” of concepts: everyday notions such as green and qing 青, philosophical concepts such as emotion(s) and qing 情, and philosophical categories such as forms of life and dao 道. We argue that interpretation is a holistic multi-directional process constrained by the principle of mutual attunement. It is necessary to assume that “the other” is a human being, who, in most cases, is consistent and stating that which is true or right. This is the condition of possibility for intercultural philosophical dialogue and comparative philosophy. No more necessary conditions are needed. There is no need to presuppose concepts or categories that are universal for all humans and their languages (such as emotion(s) and qing 情).  相似文献   

15.
Orthogonal procrustes rotation for two or more matrices   总被引:2,自引:0,他引:2  
Necessary and sufficient conditions for rotating matrices to maximal agreement in the least-squares sense are discussed. A theorem by Fischer and Roppert, which solves the case of two matrices, is given a more straightforward proof. A sufficient condition for a best least-squares fit for more than two matrices is formulated and shown to be not necessary. In addition, necessary conditions suggested by Kristof and Wingersky are shown to be not sufficient. A rotation procedure that is an alternative to the one by Kristof and Wingersky is presented. Upper bounds are derived for determining the extent to which the procedure falls short of attaining the best least-squares fit. The problem of scaling matrices to maximal agreement is discussed. Modifications of Gower's method of generalized Procrustes analysis are suggested.  相似文献   

16.
Bob Plant 《Metaphilosophy》2017,48(1-2):3-24
This article argues for four interrelated claims: (i) Metaphilosophy is not one sub‐discipline of philosophy, nor is it restricted to questions of methodology. Rather, metaphilosophical inquiry encompasses the general background conditions of philosophical practice. (ii) These background conditions are of various sorts, not only those routinely considered “philosophical” but also those considered biographical, historical, and sociological. Accordingly, we should be wary of the customary distinction between what is proper (internal) and merely contingent (external) to philosophy. (iii) “What is philosophy?” is best understood as a practical question concerning how members of different philosophical sub‐communities identify what is pertinent to their respective activities and self‐conceptions. (iv) Given (i)–(iii), understanding what philosophy is requires us to take more seriously the social‐institutional dimension of contemporary philosophical practice.  相似文献   

17.
Abstract

This paper argues for the need of philosophical translator-advocates to overcome the (would-be) limitations produced by the linguistic narrowness of analytic philosophy. It draws on a model used to analyze epistemic communities in order to characterize a form of linguistic injustice. In particular it does so by treating language as an epistemic barrier to entry of ideas and people and by treating philosophical translator-advocates as engaged in a form of arbitrage. Along the way I specify some necessary and jointly sufficient characteristics of a philosophical translator-advocate. My argument is illuminated and vivified with examples from the history of analytic philosophy and other episodes from the history of philosophy.  相似文献   

18.
19.
Macklin R 《Synthese》1983,57(2):205-224
Psychiatrists are frequently called upon to make assessments of the rationality or irrationality of persons for a variety of medical-legal purposes. A key category is that of evaluations of a patient's capacity to grant informed consent for a medical procedure. A diagnosis of mental illness is neither a necessary nor a sufficient condition for a finding of incompetence. The notion of competency to grant consent, which is a mixed psychiatric-legal concept, shares some features with philosophical conceptions of rationality, but differs from them in a number of important respects. This article describes the actual practice of psychiatrists when making such judgments, along with the standards of competency they employ. A comparison is made between those notions of competency and predominant philosophical conceptions of rationality.  相似文献   

20.
The concepts of (i) being, (ii) change, (iii) causation, (iv) action, and (v) purpose are concepts of decreasing generality, in this sense: (a) each can be understood only in terms of its predecessor on the list, and (b) while the first applies to everything, the others, in order, have an increasingly narrow scope. Much Western philosophy has amounted to an attempt to reduce one or more of these to those that precede them, and thus eliminate them as concepts necessary for philosophical understanding, but all such attempts seem to have failed. Hume did not reduce (iii) to (ii), the numberless attempts to reduce (iv) to (iii) seem clearly to have failed, and, what very few seem as yet to have realized, the attempts to reduce (v) to (iv) are unpromising. Not only is agency necessary for understanding human behavior, it seems also necessary to understanding thought, and the same appears true of the concept of purpose.  相似文献   

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