Frege on Truth,Assertoric Force and the Essence of Logic

In a posthumous text written in 1915, Frege makes some puzzling remarks about the essence of logic, arguing that the essence of logic is indicated, properly speaking, not by the word ‘true’, but by the assertoric force. William Taschek has recently shown that these remarks, which have received only little attention, are very important for understanding Frege's conception of logic. On Taschek's reconstruction, Frege characterizes logic in terms of assertoric force in order to stress the normative role that the logical laws play vis-à-vis judgement, assertion and inference. My aim in this paper is to develop and defend an alternative reconstruction according to which Frege stresses that logic is not only concerned with ‘how thoughts follow from other thoughts’, but also with the ‘step from thought to truth-value’. Frege considers logic as a branch of the theory of justification. To justify a conclusion by means of a logical inference, the ‘step from thought to truth-value’ must be taken, that is, the premises must be asserted as true. It is for this reason that, in the final analysis, the assertoric force indicates the essence of logic, for Frege.     

真的概念

弗雷格的语义学蕴涵了两个不可调和的推论:其一认为语句的意义先于命题,命题先于真,这种观点发展成为最少量论;其二认为真先于命题,因而也先于语句的意义,这种观点发展成为成真条件论.结合维特根斯坦的意义即用法的观点,得出的结论是:意义理论的核心概念并不是真,而是一个陈述得到证明的观念,意义理论并不必须采取成真条件论的形式.作为最少量论和成真条件论共同基础的奎因式语义转换原则是包含矛盾的.结合了语义转换原则和塔斯基真的定义的最少量论者必定排除戴维森式成真条件论.     

The Face of Truth

I attempt to explain Plato's choice of dialogue through an analysis of what he regarded as the conditions of knowledge acquisition. I see the main contribution of the paper in exposing the way in which time and pain are, for Plato, conditions of knowledge acquisition. Plato endorsed the "learning through suffering," or pathei mathos , convention, central to Greek drama, and did so not through theory but through the praxis some of the dialogues employ. This addition of experiential components to the more cognitively oriented definitions of knowledge that Socrates uses complicates what these works may say about human knowledge. I analyze these tensions and the bearing they may have on the question of Plato's choice of dialogue, that is, on his rhetoric in practice. The requirements for actual persuasion, as Plato specifies them in the Seventh Letter, , are only partially met by the fictional scenes of argumentation and knowledge conveying that Plato presents. However, such scenes permit transcending some of the limitations of written, systematic, nonpersonal discourse. The presentation of such interactions to a real reader through dialogue turns into a mode of writing that is closer to meeting the demands of actual communication of knowledge – at least knowledge regarding what Plato envisaged as being the highest sort of epistemic communication     

真之本性

本文是兰姆赛的一篇经典论文,在文中,兰姆赛提出了他的“真之冗余论”的基本观点：只有具有命题指称并且有断定特性的信念才能成为真之载体,一个信念P是真的,当且仅当P。     

The Spirit of Truth

This article reflects on the theme of the “spirit of truth” in a post-truth era – a time in which objective truth seems to no longer exist, any given claim can be substantiated, and it is no longer possible to tell falsehood and truth apart. Focusing on the objectivity of science, the humanity of truth, and the spirit of truth revealed by divinity, the article argues for the adoption of a humane and ecological wisdom, seeing it as a way to deal with humanity’s immense knowledge in a way that is conducive to life, to avoid optimizing humans in a “trans-human” way and making the earth uninhabitable.     

The Truth About Deception

The prohibition on lying is often thought to be very stringent. Some have even been tempted to think that it is absolute. In contrast, the prohibition on other forms of deception seems to be looser. This paper explores the relationship between the duty not to deceive and the duty not to lie. This discussion is situated in the context of a broadly Kantian account of morality. Kant himself infamously claimed that one ought not lie to a murderer at the door about the location of his intended victim. This paper aims to explain how a broadly Kantian view can endorse a distinctive duty not to lie without thereby being committed to this kind of conclusion.     

The Logic of Pragmatic Truth

The mathematical concept of pragmatic truth, first introduced in Mikenberg, da Costa and Chuaqui (1986), has received in the last few years several applications in logic and the philosophy of science. In this paper, we study the logic of pragmatic truth, and show that there are important connections between this logic, modal logic and, in particular, Jaskowski's discussive logic. In order to do so, two systems are put forward so that the notions of pragmatic validity and pragmatic truth can be accommodated. One of the main results of this paper is that the logic of pragmatic truth is paraconsistent. The philosophical import of this result, which justifies the application of pragmatic truth to inconsistent settings, is also discussed.     

The Truth of the Matter

Feminist standpoint theory (FST) has a troubled history that has limited its use and development as a core feminist epistemological project. This article revisits debates from its past, and re‐examines an apparent central problem: that of the realism identifiable in FST. Looking closely at the criticism leveled against one particular standpoint theorist—Nancy Hartsock—I show the criticism not only to be unfounded, as has previously been argued, but also unnecessary. I demonstrate that the accusations of supposedly realist contradictions in Hartsock's work are easily resolvable by engagement with critical realism (CR). I argue that CR not only accommodates Hartsock's conception of realism, and so dissolves any contention, but that CR complements and shores up FST's central claim: that situated knowledge carries with it an epistemic privilege. Another contemporary conception of realism is being developed—New Materialism (NM)—that, it could be argued, would also be a suitable ontology with which to develop FST. I show how NM could present problems for FST as a fundamentally political project, and conclude that CR offers a more fruitful future collaboration for FST.     

数学真理的问题

在当前数学实践中,数学知识（如果有这样的知识的话）是通过在定义和公理的基础上证明定理来获得的。问题在于该怎样理解证明中所得到的东西是如何构成知识的,具体而言,即是要给出一个关于数学真理和数学知识的统一的解释,该解释能够揭示两者的内在联系。此处的困难是,根据贝纳塞拉夫的为人熟知的论证,由于塔斯基语义学认为真与对象的联系（通过单称词项或通过量词）是不可消去的,因此在数学中无法将塔斯基语义学与完整的认识论相结合：数学知识要么是通过证明得到的,这种情况下数学知识与数学对象是无关的,因此我们就无法解释数学真理;要么数学对象是数学真理的构件,从而数学知识不是通过证明得到的,这种情况下我们就无从理解数学知识。接着,本文通过一系列阶段,将这些困难一直追溯到最基本的逻辑观念,即将之看作形式的和纯粹解释性的：如果数学是从概念出发仅仅使用逻辑的推理实践,依照康德,那么数学应该是分析的,也即,仅仅是解释性的,根本就不是通常意义上的知识。我认为,这对数学真理是真正困难的问题。本文概括了四种回应,其中仅有一个有希望解决我们的困难,也即皮尔斯和弗雷格的回应。根据他们的方案,逻辑是科学,因此是实验性的和可错的;符号语言是有内容的,尽管并不涉及与任何对象的关联;证明是构成性的,因此是富于产出的过程。通过充分发展这些观点,我们将有可能最终解决数学真理的问题。