Jaroslav Peregrin

O nějaké činnosti v rámci nějakého lidského společenství říkám, že je řízená pravidly , jsou‐li určité způsoby provozování této činnosti systematicky brány členy tohoto společenství, nebo nějakou jeho podskupinou, za správné, a jiné za nesprávné. Braní za správné či nesprávné (neboli normativní postoje ) beru v podstatě za dále neanalyzovatelné behaviorální vzorce, není to tedy pojem, který by primárně odkazoval k něčemu jako je kognitivní výbava účastníků, rozhodně nepředpokládá nic takového, jako že jsou tyto postoje věcí něčeho jako jsou plnohodnotná přesvědčení. Hlavními symptomy těchto vzorců jsou určité typy reakcí na to, co dělají druzí; v extrémním případě snaha jim v děláním určitých věcí za každou cenu zabránit či je k němu naopak přimět. Často jde ale o mnohem subtilnější projevy "souhlasu" či "nesouhlasu" (od různých forem "odměn" a "trestů" po všelijaké náznaky "souznění" a "nevole") – projevy, které se člověk v rámci začleňování do lidských společenství učí rozpoznávat jako jisté "společenské tření", které ho v tom, co by měl a neměl dělat, usměrňuje

When Bob Brandom, six years after publishing his opus magnum Making it explicit (hereafter MIE)1, produced his slender Articulating reasons2, many people expected that finally they would have a concise introduction to his philosophical views. Their expectations, however, were to be dashed: Articulating reasons is a heterogeneous collection of texts elaborating on some of the topics of MIE and hardly digestible without the background of MIE3. As yet, Brandom has produced nothing that could be taken as introductory. His subsequent books are either collections of essays addressing topics contained in or connected with MIE (Tales of the mighty dead4, Reason in Philosophy5 or the not yet published Perspectives on Pragmatism6), or engaged with Brandom's new philosophical doctrine, viz. analytic pragmatism, which is the case of Between Saying and Doing7. The last one, of course, is not unrelated to MIE, but it emphasizes different aspects of the enterprise; hence it is unlikely to pave the way to MIE for a perplexed reader. Until recently I was convinced that no readable introduction to Brandom's views therefore existed. Now I see I was mistaken. Though I knew that there was a book devoted to Brandom, by Jeremy Wanderer, I suspected it was more of a scientific biography than an introduction to the inferentialism of MIE; but in fact it is precisely the book I was missing: a congenial and comprehensible introduction to the ideas of Brandom's MIE. Hurrah!, a book my students, desperately wrestling with MIE, can be referred to!

Suppose for a moment, that J.R.R. Tolkien, the famous author of the cult fantasy saga Lord of the Rings, did not publish anything of his writings during his lifetime; suppose that after his death the manuscripts of all his writings are lying on his table. Where, then, is the Middlearth, the glorious land of hobbits, dwarfs, elfs and human heroes, situated? We might be tempted to say that it is within our world, namely inside the pile of the papers on the writer’s table - for it exists solely through the letters written on these papers. However, to say this would be wrong - surely we do not expect that should the heroes of the book walk in a straight line long enough, they would cross the boundaries of the book and appear in Mr. Tolkien’s room. Middlearth is, of course, not within our world - despite existing solely due to certain things which are within it. Now the situation is not substantially different actually, when Middlearth does not exist solely through a single pile of papers, but rather through millions of printed copies of Tolkien’s books and through the minds of millions of their readers. Again, the land exists exclusively through the existence of entities which are parts of our world, but this does not mean that the land itself is a part of our world. The point of this anecdotal excursion is now that this relationship between our world and Middlearth is, in a sense, similar to the relationship between our physical space of things and „the space of reasons“ ; or between „the causal story“ and „the justificatory story“. Like Middlearth, the space of reasons exists exclusively due to us, humans, and our minds, and in this sense we might be tempted to situate it in our world, to see it as a certain, perhaps scattered, compartment of the world of things within which we live; but just as in the case of Middlearth, this might be dangerously misguiding.

The topic of this paper is the question whether there is a logic which could be justly called the logic of inference. It may seem that at least since Prawitz, Dummett and others demonstrated the proof-theoretical prominency of intuitionistic logic, the forthcoming answer is that it is this logic that is the obvious choice for the accolade. Though there is little doubt that this choice is correct (provided that inference is construed as inherently single-conclusion and complying with the Gentzenian structural rules), I do not think that the usual justification of it is satisfactory. Therefore, I will first try to clarify what exactly is meant by the question, and then sketch a conceptual framework in which it can be reasonably handled. I will introduce the concept of 'inferentially native' logical operators (those which explicate inferential properties) and I will show that the axiomatization of these operators leads to the axiomatic system of intuitionistic logic. Finally, I will discuss what modifications of this answer enter the picture when more general notions of inference are considered

There are various approaches to truth and knowledge (in fact, cataloguing them has become something of a philosophical industry of its own); and in many cases, their explanations are taken to underlie the explanation of other crucial concepts, like language, reason etc. Especially in recent years, some of the approaches have come to be based on reducing semantics to pragmatics. An outstanding example of such a pragmatist approach is that of Bob Brandom, who bases the explication of both truth and knowledge on his consideration of normative pragmatics. A less explicitly pragmatist approach to truth and knowledge was offered by Donald Davidson (who is surely not a pragmatist in the narrow sense of the word, but may be thought about as one in the wider sense proposed by Brandom, 2002, in which pragmatism means starting from the practical rather than the theoretical). In this paper I would like to point out that the discrepancy between these two approaches may be smaller than it would prima facie seem. To show this, I first turn my attention briefly to the general problem of theoretically accounting for human minds.

Wilfrid Sellars's analysis of the concept of meaning led, in effect, to the conclusion that the meaning of an expression is its inferential role. This view is often challenged by the claim that inference is a matter of syntax and syntax can never yield us semantics. I argue that this challenge is based on the confusion of two senses of "syntax"; and I try to throw some new light on the concept of inferential role. My conclusion is that the Sellarsian view that something can have meaning only if it is subject to inferences is viable, and that inferential role is a plausible explication of meaning. However I also argue, pace Sellars, that the inferential nature of meaning does not prevent us from engaging in the enterprise of Carnapian formal semantics

Když jsem v roce 1992 začínal na filosofické fakultě UK přednášet teorii sémantiky, cítil jsem intenzivní potřebu poskytnout studentům nějaký učební text. O překotném vývoji tohoto interdisciplinárního oboru, který odstartovalo v sedmdesátých letech úspěšné “zkřížení logiky s lingvistikou” Richardem Montaguem a dalšími a který se nezpomalil dodnes, totiž v češtině neexistovaly prakticky žádné zprávy (s čestnou výjimkou přístupu tzv. transparentní intenzionální logiky, který byl dílem českého emigranta Pavla Tichého a o kterém u nás psal Pavel Materna). Přehledové publikace, jaké jsou potřeba pro někoho, kdo se chce v dané problematice zorientovat, se ovšem v té době i po světě teprve začínaly objevovat: v roce 1990 vyšla kniha An Introduction to Semantics Gennara Chierchii a Sally McConell-Ginnetové a v roce 1991 vydala skupina holandských logiků pod kolektivním pseudonymem L.T.F. Gamut dvousvazkovou knihu Language and Meaning. Za této situace jsem se pokusil co nejrychleji sepsat učební text, který by moji studenti i jiní zájemci o sémantiku mohli použít; a protože o jeho vydání paradoxně projevila větší zájem filosofická fakulta Masarykovy univerzity v Brně (kde jsem já osobně nikdy neučil; ale zájem o sémantiku tam neúnavně podněcoval a vydání mého textu tam zprostředkoval kolega Materna) než filosofická fakulta mojí domovské Karlovy univerzity, vyšel tento text v Brně, a to pod názvem Úvod do teoretické sémantiky.

Normativity is one of the keywords of contemporary philosophical discussions (which partly reincarnate traditional debates about the differences between Geisteswissenschaften and Naturwissenschaften ). But are the philosophers who argue for the irreducible role of normativity within accounts for human societies obliged to assume, as Stephen Turner has recently put it, the existence of a "non‐natural, non‐empirical stuff that is claimed to be necessarily, intrinsically there and to in some sense account for the actual"?

Logic is usually considered to be the study of logical consequence – of the most basic laws governing how a statement’s truth depends on the truth of other statements. Some of the pioneers of modern formal logic, notably Hilbert and Carnap, assumed that the only way to get hold of the relation of consequence was to reconstruct it as a relation of inference within a formal system built upon explicit inferential rules. Even Alfred Tarski in 1930 seemed to foresee no kind of consequence other than one induced by a set of inference rules: "Let A be an arbitrary set of sentences of a particular discipline. With the help of certain operations, the so-called rules of inference, new sentences are derived from the set A, called the..

Within human communities, the phenomenon of rules is ubiquitous. We have the allimportant rules that are codified by our law; we have rules that are not authoritatively written down, but are usually followed (like the rule that if somebody helps me, I should be prepared to help him in turn); we have traffic rules; and the rules of various games and sports. Yet, from the scientific viewpoint, rules are not easy to account for. How is their emergence to be explained (in a way compatible with evolution), and how is their existence to be construed, especially in cases when they are not written down? Are we to consider a rule as primarily a linguistic object; or are we to reduce it to some regularity of behavior? Neither of these two forms of existence holds much allure. Firstly, insofar as some rules clearly exist without being recorded, there is no linguistic object with which they can be identified. (After all, we talk about the encoding of the law, which seems to suggest that the law articulates something existing independently of the code.) And secondly, reducing the existence of a rule to a plain regularity of behavior would extinguish any distinction between billiard balls 'following the rules' of mechanics and human subjects following the rules of their society. Hence it would seem that, though there must be more to rules than regularities, at least some rules must be capable of existing exclusively 'within' human conduct – being, as Willfrid Sellars (1949, 299) put it, written "in flesh and blood, or nerve and sinew, rather than in pen and ink".

Kniha, jako je tato, nemůže být tak docela dílem jediného člověka. Dovést ji do podoby koherentního celku bych nedokázal bez pomoci svých kolegů, kteří po mně text četli a upozornili mě na spoustu chyb a nedůsledností, které se v něm vyskytovaly. Můj dík v tomto směru patří zejména Vojtěchu Kolmanovi, Liboru Běhounkovi a Martě Bílkové. Za připomínky k různým částem rukopisu jsem vděčen i Pavlu Maternovi, Milanu Matouškovi, Prokopu Sousedíkovi, Vladimíru Svobodovi, Petru Hájkovi a Grahamu Priestovi. Kniha vznikla v rámci projektu podpořeného grantem AV ČR číslo A0009001/00.

In part one, I give an (unsystematic) overview of the development of logical tools which have been employed in the course of the analysis of referring expressions, i.e. definite and (specific) indefinite singular terms, of natural language. I present Russell's celebrated theory of definite descriptions which I see as an attempt to explain definite reference in terms of unique existence (and reference in general in terms of existence simpliciter); and I present Hilbert's E-calculus as an attempt to explain existence in terms of choice. Then I turn to contemporary, dynamic approaches to the analysis of singular terms and point out that only within a dynamic framework can the Russellian and Hilbertian ideas yield a truly satisfactory analysis of singular terms, and consequently of reference and coreference. I call attention to the fact that current results of formal semantics demonstrate the advantages of viewing singular terms as denoting updates, i.e. as a means of changing the context (information state), and especially that part of the context which I call the individually