Les 10 principes de Justice Handie ont été rédigés en 2015, dans un contexte nord-américain où les milieux de justice sociale peinaient à considérer les enjeux des personnes handicapées et racisées. Version plus longue consultable sur www.sinsinvalid.org.

The argument from illusion attempts to establish the bold claim that we are never perceptually aware of ordinary material objects. The argument has rightly received a great deal critical of scrutiny. But here we develop a criticism that, to our knowledge, has not hitherto been explored. We consider the canonical form of the argument as it is captured in contemporary expositions. There are two stages to our criticism. First, we show that the argument is invalid. Second, we identify premises that (...) can be used to make the argument valid. But we argue that the obvious fixes are problematic. If our arguments are successful, we show that the argument from illusion is even more difficult to defend than is commonly acknowledged. (shrink)

Keith DeRose gives an invalid argument for contextualism in “Assertion, Knowledge, and Context.” In section 2.4, entitled “The Argument for Contextualism,” DeRose makes the following remarks. “The knowledge account of assertion provides a powerful argument for contextualism: If the standards for when one is in a position to warrantedly assert that P are the same as those that comprise a truth-condition for ‘I know P,’ then if the former vary with context, so do the latter. In short: The knowledge account (...) of assertion together with the context-sensitivity of assertability yields contextualism about knowledge”. (shrink)

Keith DeRose gives an invalid argument for contextualism in “Assertion, Knowledge, and Context.” In section 2.4, entitled “The Argument for Contextualism,” DeRose makes the following remarks. “The knowledge account of assertion provides a powerful argument for contextualism: If the standards for when one is in a position to warrantedly assert that P are the same as those that comprise a truth-condition for ‘I know P,’ then if the former vary with context, so do the latter. In short: The knowledge account (...) of assertion together with the context-sensitivity of assertability yields contextualism about knowledge”. (shrink)

This volume studies a range of modernist works by writers such as Virginia Woolf, Oscar Wilde, Henry James, and James Joyce to explore what Modernism looks like when viewed through the lens of disability.

According to the common thinking of continental European lawyers, a rule is invalid each and every time either it was not produced in accordance with the metarules which govern the production of rules in the system, or it is inconsistent with a “superior” (higher‐ranked) rule belonging to the same system. Thus, a better understanding of the concept of invalidity demands a careful inquiry into the various kinds of meta‐rules which govern the production of rules as well as into the (...) various kinds of normative hierarchies. The paper is mainly devoted to such an analysis. Five different grounds for invalidity are distinguished. The analysis further shows that invalidity can affect rules as well as legal provisions and legal sources. Further, invalidity should be sharply distinguished from non‐existence (existence being a sufficient condition for rules to be applied). In most legal systems, invalid rules too are susceptible of judicial application: At least, until their invalidity is “declared” (in a constitutive way) by a competent organ (namely, a constitutional court, as far as statutory rules are concerned). (shrink)

One crucial premise in the argument from illusion is the Phenomenal Principle. It states that if there sensibly appears to be something that possesses a sensible quality, then there is something of which the subject is aware that has that sensible quality. The principle thus enables the inference from a mere appearance to an existence (usually a mental one). In the argument from appearance, a similar move is taken by some philosophers—they infer a content from a mere appearance. There are (...) two kinds of defences for the Phenomenal Principle in the literature, namely, the epistemological one (e.g. H.H. Price) and the semantic one (e.g. Frank Jackson). I argue that neither consolidates the Phenomenal Principle. I particularly demonstrate that the appearance verb in premise 1 of the argument from illusion is not used in the phenomenal sense as it is used in the Phenomenal Principle, which renders the argument essentially invalid. To avoid invalidity, the proponents either give up the phenomenal use, which makes the argument unable to serve its original purpose, i.e. inferring an unusual existence, or they insist on the phenomenal use in all premises of the argument, which will trivialise the argument. I also demonstrate that a similar objection applies to the argument from appearance. (shrink)

In a recent paper, Reuter, Seinhold and Sytsma put forward an implicature account to explain the intuitive failure of the pain-in-mouth argument. They argue that utterances such as ‘There is tissue damage / a pain / an inflammation in my mouth’ carry the conversational implicature that there is something wrong with the speaker’s mouth. Appealing to new empirical data, this paper argues against the implicature account and for the entailment account, according to which pain reports using locative locutions, such as (...) ‘There is a pain in my mouth’, are intuitively understood as entailing corresponding predicative locutions, such as ‘My mouth hurts.’ On this latter account, the pain-in-mouth argument seems invalid because the conclusion is naturally understood as entailing something which cannot be inferred from the premisses. Implications for the philosophical debate about pain are also drawn. (shrink)

The universality assumption (“U”) that quantum wave states only evolve by linear or unitary dynamics has led to a variety of paradoxes in the foundations of physics. U is not directly supported by empirical evidence but is rather an inference from data obtained from microscopic systems. The inference of U conflicts with empirical observations of macroscopic systems, giving rise to the century-old measurement problem and subjecting the inference of U to a higher standard of proof, the burden of which lies (...) with its proponents. This burden remains unmet because the intentional choice by scientists to perform interference experiments that only probe the microscopic realm disqualifies the resulting data from supporting an inference that wave states always evolve linearly in the macroscopic realm. Further, the nature of the physical world creates an asymptotic size limit above which interference experiments, and verification of U in the realm in which it causes the measurement problem, seem impossible for all practical purposes if nevertheless possible in principle. This apparent natural limit serves as evidence against an inference of U, providing a further hurdle to the proponent’s currently unmet burden of proof. The measurement problem should never have arisen because the inference of U is entirely unfounded, logically and empirically. (shrink)

This paper is based on the comments I gave to Alfred Mele regarding his original Zygote Argument during my presentation at a small workshop on manipulation arguments in Budapest back in 2012. After those comments, Mele changed the conclusion of his original Zygote Argument and redefined 'incompatibilism' so that it would refer to the conclusion of his new Zygote Argument (Mele 2013+). Yet, over the last decade, Mele has made no comment in print about the changes he made nor the (...) invalidity objection that led to them. To my knowledge, Mele has only mentioned this 2015 paper once: in the context of defending his non-explanatory definition of 'incompatibilism' at the opening of Aspects of Agency (p. 6, n. 4), Mele draws his readers' attention to just *just this paper* as a place where they'll find the type of nonstandard/nontraditional definition of 'incompatibilism' that he rejects. If Mele had a general concern about unusual definitions of 'incompatibilism', he could have just as easily named almost any leading figure in free will for this purpose (since most reject the non-explanatory definition he now endorses). But for some reason, Mele thought an unemployed junior researcher should be singled out as an example. Moreover, if Mele were genuinely interested in helping his readers understand the ambiguity of terms like 'compatibilism' and 'incompatibilism' it is a mystery that he referenced a paper in which nothing of substance hung on the definitions given to these terms when he might have instead pointed them to my OTHER 2015 paper in which the MAIN AIM of the paper is to expose the difficulties facing anyone who wants to define the terms 'compatibilism' and 'incompatibilism' in a way that everyone will accept (including a critique of the definitions that Mele has adopted). By all appearances, Mele's aim was to give readers the false impression that my working definition of 'incompatibilism' played some role in my charge that his argument is invalid (which it doesn't, given that the term doesn't appear in either the premises or conclusion of that argument). In this paper, I simply use the invalidity of the simple 2-premise Zygote Argument to make a series of more philosophically significant points (e.g. regarding the dialectical structure of the free-will debate, the role of best-explanation reasoning, and to develop the first-ever "master manipulation argument"). Mele pays no attention to my answer to the "Now What?" question in this paper, even though that answer was the paper's main point. For those interested in a more recent discussion of how the logical and metaphilosophical observations made in this paper have helped to move the free-will debate forward, I suggest my contributions to the Wiley-Blackwell Companion to Free Will (Intro and Chapter 4, 2023) and my paper "Free Will, Self-Creation, and the Paradox of Moral Luck" (2019). (shrink)

Inclusive legal positivism maintains that the existence and content of laws may, but need not, depend on standards of morality. As Wil Waluchow argues, inclusive positivism derives much of its plausibility through its explanation of Charter societies such as Canada. On his account, the fundamental rights of political morality contained in the Canadian Charter of Rights and Freedoms serve as ultimate criteria of the existence or validity of all laws in Canada, and thus form part of Canada's rule of recognition. (...) In this paper I challenge Waluchow's inclusive positivist picture of Charter challenges. I argue instead that exclusive legal positivism, which maintains that resort to moral reasons may never figure in determinations of the existence or content of laws, better captures our ordinary understanding of the authoritative role of judges, constitutionality, and the traditional positivist conception of legal validity as a matter of social fact. Specifically, I argue that Joseph Raz's notion of a directed law-making power, and not reliance on an inclusive positivist rule of recognition, best explains the duty of judicial review in Charter cases. Further, the fundamental rights of political morality recognized in the Charter are best understood as constitutional objectives, and not criteria of validity, which all subordinate laws in Canada ought to respect, yet may fail to do so in practice. (shrink)

In this article, I present a schema for generating counterexamples to the argument form known as Hypothetical Syllogism with indicative conditionals. If my schema for generating counterexamples to HS works as I think it does, then HS is invalid for indicative conditionals.

ABSTRACT There are many ways of understanding what it is for an argument to be valid. Although we usually identify the concept of validity with logical validity and, in turn, we typically take this to capture the notion of necessary preservation of truth in virtue of logical form, this is just one way in which validity can be explained. A different understanding of the notion of validity that has received some attention recently is based on the idea that an argument (...) is valid just in case accepting its premises is incoherent with rejecting its conclusion. The main claim of the paper will be that, under this understanding of the notion of validity, the usual reasons to privilege a treatment of validities over a treatment of invalidities loose much of their force. Validity and invalidity are on a par, which means that there are no strong reasons to treat validities primitively and to define invalidities in terms of them. (shrink)

In this paper, I respond to the paper “The Validation of Induction” by Robert Pargetter and John Bigelow (Australasian Journal of Philosophy, 75:1, 1997), in which the authors propound the thesis that the arguments commonly thought of as good inductive arguments “properly construed, are deductively valid”. I maintain that they have not established this claim, and neither have they established a number of associated but logically independent claims that they make about inductive arguments and inductive inferences.

In Chapter 7 of The Taming of the True, Neil Tennant provides a new argument from Michael Dummett's ``manifestation requirement'' to the incorrectness of classical logic and the correctness of intuitionistic logic. I show that Tennant's new argument is only valid if one interprets crucial existence claims occurring in the proof in the manner of intuitionists. If one interprets the existence claims as a classical logician would, then one can accept Tennant's premises while rejecting his conclusion of logical revision. Thus, (...) Tennant has provided no evidence that should convince anyone who is not already an intuitionist. Since his proof is a proof for the correctness of intuitionism, it begs the question. (shrink)

In Chapter 7 of The Taming of the True, Neil Tennant provides a new argument from Michael Dummett's ``manifestation requirement'' to the incorrectness of classical logic and the correctness of intuitionistic logic. I show that Tennant's new argument is only valid if one interprets crucial existence claims occurring in the proof in the manner of intuitionists. If one interprets the existence claims as a classical logician would, then one can accept Tennant's premises while rejecting his conclusion of logical revision. Thus, (...) Tennant has provided no evidence that should convince anyone who is not already an intuitionist. Since his proof is a proof for the correctness of intuitionism, it begs the question. (shrink)

I first provide an analysis of Joel Feinberg’s anti-paternalism in terms of invalidation of reasons. Invalidation is the blocking of reasons from influencing the moral status of actions, in this case the blocking of personal good reasons from supporting liberty-limiting actions. Invalidation is shown to be distinct from moral side constraints and lexical ordering of values and reasons. I then go on to argue that anti-paternalism as invalidation is morally unreasonable on at least four grounds, none of which presuppose that (...) people can be mistaken about their own good: First, the doctrine entails that we should sometimes allow people to unintentionally severely harm or kill themselves though we could easily stop them. Second, it entails that we should sometimes allow perfectly informed and rational people to risk the lives of themselves and others, though they are in perfect agreement with us on what reasons we have to stop them for their own good. Third, the doctrine leaves unexplained why we may benevolently coerce less competent but substantially autonomous people, such as young teens, but not adults. Last, it entails that there are peculiar jumps in justifiability between very similar actions. I conclude that as liberals we should reject anti-paternalism and focus our efforts on explicating important liberal values, thereby showing why liberty reasons sometimes override strong personal good reasons, though never by making them invalid. (shrink)

In this commentary we suggest that asymmetries in reasoning associated with moral judgment do not necessarily invalidate a theory-theory account of naïve psychological reasoning. The asymmetries may reflect a core knowledge assumption that human nature is prosocial, an assumption that heightens vigilance for antisocial dispositions, which in turn leads to differing assumptions about what is the presumed topic of conversation.

Argument-forms exist which are valid over finite but not infinite domains. Despite understanding of this by formal logicians, philosophers can be observed treating as valid arguments which are in fact invalid over infinite domains. In support of this claim I will first present an argument against the classical pragmatist theory of truth by Mark Johnston. Then, more ambitiously, I will suggest the fallacy lurks in certain arguments for physicalism taken for granted by many philosophers today.

Determinations of ability/disability are rooted in coloniality, specifically in categorizations of race, gender, and animality as they bear on social formations. I elucidate this rootedness by weaving the “coloniality of ability” into María Lugones’ accounts of the coloniality of gender and the colonial-modern system as founded on the “human-nonhuman” difference. This enables me to reveal an “ability system” based on the “ability-bestiality” difference and delineate with more specificity liminal sites of oppression and resistance across the heterogeneous socialities of coloniality-modernity. From (...) the perspective of the coloniality of ability that I develop, I focus on the liminality of the white woman Victorian invalid and that of the colonized “bestial” body in order to distinguish between two forms of colonial-modern liminality—“light” and “dark.” I also draw from this discussion two forms of colonial-modern oppression—“dehumanizing” and “bestializing”—and two related modalities of anticolonial resistance—“humanizing” and “decolonial.”. (shrink)

In studying logic, one learns how to establish that a conclusion follows from a set of premises. Those arguments that exhibit one of the valid forms of the deductive system under study are valid. There may be questions about what forms are exhibited by various arguments - Is this English conditional really truth-functional? Is this disjunction really inclusive? Are the English predicates used with uniform meaning? - but none of these problems undermine the claim that if an argument exhibits a (...) valid form of a system for deductive logic, then that argument is valid.When we move on to study invalidity, however, we find that the situation is not parallel. Every argument is an instance of some invalid argument forms, and we cannot say that every instance of every invalid form is invalid. (shrink)

Abstract:Liberal thinkers of the Enlightenment understood that surplus moral constraints, imposed by invalid moral norms, are a serious limitation on liberty. They also recognized that overcoming surplus moral constraints — what we call proper de-moralization — is an important dimension of moral progress. Contemporary philosophical theorists of liberty have largely neglected the threat that surplus moral constraints pose to liberty and the importance of proper de-moralization for human emancipation. This essay examines the phenomena of surplus moral constraints and proper de-moralization, (...) utilizing insights from biological and cultural evolutionary thinking. (shrink)

Curry claims that the positive paradox principle, ` A ⊃ in his elementary statement presentation, ‘is valid in any normal interpretation’ . By previous definition, ‘an interpretation of a system S is a normal interpretation just when the proposition A is true when and only when ` A’ . But his argument to normal validity is interestingly, and relevantly, invalid.

There are many approaches to paraconsistency, ranging from the very moderate to the more radical. In this paper I explore and extend the more radical end of the spectrum, where there are truth-value gluts. In particular I will look at paraconsistent metatheory – the machinery of truth, validity, and proof  as developed in a glut-friendly paraconsistent setting. The aim is to evaluate the philosophical and technical tenability of such an approach. I will show that there are very significant technical (...) challenges to face on this sort of radical approach, but that there is good philosophical support for facing these challenges. (shrink)

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain (...) in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant. (shrink)

One of the most pressing objections against Divine simplicity is that it entails what is commonly termed a ‘modal collapse’, wherein all contingency is eliminated and every true proposition is rendered necessarily true. In this paper, I show that a common form of this argument is in fact famously invalid and examine three ways in which the opponent of Divine simplicity might try to repair the argument. I conclude that there is no clear way of repairing the argument that does (...) not beg the question against the doctrine of Divine simplicity. (shrink)

In a challenge to Basic Emotion theories, Ortony suggested in a recent article that the existence of affect-free surprise means that surprise is not necessarily valenced and therefore arguably not an emotion. In an article in response, Neta and Kim argued that surprise is always valenced and therefore is an emotion, with apparent cases of affect-free surprise actually being cases of the cognitive state of unexpectedness rather than surprise. We view Neta and Kim's position as resting on an idiosyncratic stipulation (...) of word usage. We further suggest that rejecting affect-free surprise by appealing to examples of affect-laden surprise has no bearing on whether surprise is always valenced, and propose that when surprise appears to be affect-laden the locus of the experienced valence is a co-occurring emotion. (shrink)

It is one thing for a given proposition to follow or to not follow from a given set of propositions and it is quite another thing for it to be shown either that the given proposition follows or that it does not follow.* Using a formal deduction to show that a conclusion follows and using a countermodel to show that a conclusion does not follow are both traditional practices recognized by Aristotle and used down through the history of logic. These (...) practices presuppose, respectively, a criterion of validity and a criterion of invalidity each of which has been extended and refined by modern logicians: deductions are studied in formal syntax (proof theory) and coun¬termodels are studied in formal semantics (model theory). The purpose of this paper is to compare these two criteria to the corresponding criteria employed in Boole’s first logical work, The Mathematical Analysis of Logic (1847). In particular, this paper presents a detailed study of the relevant metalogical passages and an analysis of Boole’s symbolic derivations. It is well known, of course, that Boole’s logical analysis of compound terms (involving ‘not’, ‘and’, ‘or’, ‘except’, etc.) contributed to the enlargement of the class of propositions and arguments formally treatable in logic. The present study shows, in addition, that Boole made significant contributions to the study of deduc¬tive reasoning. He identified the role of logical axioms (as opposed to inference rules) in formal deductions, he conceived of the idea of an axiomatic deductive sys¬tem (which yields logical truths by itself and which yields consequences when ap¬plied to arbitrary premises). Nevertheless, surprisingly, Boole’s attempt to imple¬ment his idea of an axiomatic deductive system involved striking omissions: Boole does not use his own formal deductions to establish validity. Boole does give symbolic derivations, several of which are vitiated by “Boole’s Solutions Fallacy”: the fallacy of supposing that a solution to an equation is necessarily a logical consequence of the equation. This fallacy seems to have led Boole to confuse equational calculi (i.e., methods for gen-erating solutions) with deduction procedures (i.e., methods for generating consequences). The methodological confusion is closely related to the fact, shown in detail below, that Boole had adopted an unsound criterion of validity. It is also shown that Boole totally ignored the countermodel criterion of invalid¬ity. Careful examination of the text does not reveal with certainty a test for invalidity which was adopted by Boole. However, we have isolated a test that he seems to use in this way and we show that this test is ineffectual in the sense that it does not serve to identify invalid arguments. We go beyond the simple goal stated above. Besides comparing Boole’s earliest criteria of validity and invalidity with those traditionally (and still generally) employed, this paper also investigates the framework and details of THE MATHEMATICAL ANALYSIS OF LOGIC. (shrink)