Carnap, Rudolf (1891–1970)

2018 ◽  
Author(s):  
Richard Creath
Keyword(s):  
Twentieth Century ◽  
A Priori ◽  
Vienna Circle ◽  
Correct Choice ◽  
Logical Empiricism ◽  
Modal Theory ◽  
Pure Logic ◽  
And Mathematics ◽  
In Virtue Of ◽  
Working Out

Carnap was one of the most significant philosophers of the twentieth century, and made important contributions to logic, philosophy of science, semantics, modal theory and probability. Viewed as an enfant terrible when he achieved fame in the Vienna Circle in the 1930s, Carnap is more accurately seen as one who held together its widely varying viewpoints as a coherent movement. In the 1930s he developed a daring pragmatic conventionalism according to which many traditional philosophical disputes are viewed as the expression of different linguistic frameworks, not genuine disagreements. This distinction between a language (framework) and what can be said within it was central to Carnap’s philosophy, reconciling the apparently a priori domains such as logic and mathematics with a thoroughgoing empiricism: basic logical and mathematical commitments partially constitute the choice of language. There is no uniquely correct choice among alternative logics or foundations for mathematics; it is a question of practical expedience, not truth. Thereafter, the logic and mathematics may be taken as true in virtue of that language. The remaining substantive questions, those not settled by the language alone, should be addressed only by empirical means. There is no other source of news. Beyond pure logic and mathematics, Carnap’s approach recognized within the sciences commitments aptly called a priori – those not tested straightforwardly by observable evidence, but, rather, presupposed in the gathering and manipulation of evidence. This a priori, too, is relativized to a framework and thus comports well with empiricism. The appropriate attitude towards alternative frameworks would be tolerance, and the appropriate mode of philosophizing the patient task of explicating and working out in detail the consequences of adopting this or that framework. While Carnap worked at this tirelessly and remained tolerant of alternative frameworks, his tolerance was not much imitated nor were his principles well understood and adopted. By the time of his death, philosophers were widely rejecting what they saw as logical empiricism, though often both their arguments and the views offered as improvements had been pioneered by Carnap and his associates. By his centenary, however, there emerged a new and fuller understanding of his ideas and of their importance for twentieth-century philosophy.

Reichenbach, Hans (1891–1953)

2018 ◽  
Author(s):  
Wesley C. Salmon
Keyword(s):  
Twentieth Century ◽  
A Priori ◽  
Vienna Circle ◽  
Philosophy Of Physics ◽  
Theory Of Relativity ◽  
Sense Experience ◽  
Space And Time ◽  
The World ◽  
Synthetic A Priori ◽  
And Mathematics

Philosophy of science flourished in the twentieth century, partly as a result of extraordinary progress in the sciences themselves, but mainly because of the efforts of philosophers who were scientifically knowledgeable and who remained abreast of new scientific achievements. Hans Reichenbach was a pioneer in this philosophical development; he studied physics and mathematics in several of the great German scientific centres and later spent a number of years as a colleague of Einstein in Berlin. Early in his career he followed Kant, but later reacted against his philosophy, arguing that it was inconsistent with twentieth-century physics. Reichenbach was not only a philosopher of science, but also a scientific philosopher. He insisted that philosophy should adhere to the same standards of precision and rigour as the natural sciences. He unconditionally rejected speculative metaphysics and theology because their claims could not be substantiated either a priori, on the basis of logic and mathematics, or a posteriori, on the basis of sense-experience. In this respect he agreed with the logical positivists of the Vienna Circle, but because of other profound disagreements he was never actually a positivist. He was, instead, the leading member of the group of logical empiricists centred in Berlin. Although his writings span many subjects Reichenbach is best known for his work in two main areas: induction and probability, and the philosophy of space and time. In the former he developed a theory of probability and induction that contained his answer to Hume’s problem of the justification of induction. Because of his view that all our knowledge of the world is probabilistic, this work had fundamental epistemological significance. In philosophy of physics he offered epoch-making contributions to the foundations of the theory of relativity, undermining space and time as Kantian synthetic a priori categories.

Later Empiricism and Logical Positivism

2009 ◽  
Author(s):  
John Skorupski
Keyword(s):  
Twentieth Century ◽  
A Priori ◽  
Vienna Circle ◽  
Logical Empiricism ◽  
Logical Positivism ◽  
Radical Empiricism ◽  
Modern Period ◽  
The 1950S ◽  
Late Modern

The empiricist approaches to mathematics discussed in this article belong to an era of philosophy which we can begin to see as a whole. It stretches from Kant's Critiques of the 1780s to the twentieth-century analytic movements which ended, broadly speaking, in the 1950s—in and largely as a result of the work of Quine. Seeing this period historically is by no means saying that its ideas are dead; it just helps in understanding the ideas. That applies to the two versions of empiricism that were most prominent in this late modern period: the radical empiricism of Mill and the “logical” empiricism associated with the Vienna Circle positivism of the late 1920s and early 1930s. Mill and the logical positivists shared the empiricist doctrine that no informative proposition is a priori.

Ayer, Alfred Jules (1910–89)

2018 ◽  
Author(s):  
Graham MacDonald
Keyword(s):  
Vienna Circle ◽  
Free Action ◽  
Negative Attitude ◽  
Logical Positivism ◽  
Sensory Experiences ◽  
Expression Of Emotion ◽  
Physical Objects ◽  
And Mathematics ◽  
Logical Notion ◽  
In Virtue Of

A.J. Ayer made his name as a philosopher with the publication of Language, Truth and Logic in 1936, a book which established him as the leading English representative of logical positivism, a doctrine put forward by a group of philosophers known as members of the Vienna Circle. The major thesis of logical positivism defended by Ayer was that all literally meaningful propositions were either analytic (true or false in virtue of the meaning of the proposition alone) or verifiable by experience. This, the verificationist theory of meaning, was used by Ayer to deny the literal significance of any metaphysical propositions, including those that affirmed or denied the existence of God. Statements about physical objects were said to be translatable into sentences about our sensory experiences (the doctrine known as phenomenalism). Ayer further claimed that the propositions of logic and mathematics were analytic truths and that there was no natural necessity, necessity being a purely logical notion. Finally the assertion of an ethical proposition, such as ‘Stealing is wrong’, was analysed as an expression of emotion or attitude to an action, in this case the expression of a negative attitude to the act of stealing. During the rest of his philosophical career Ayer remained faithful to most of these theses, but came to reject his early phenomenalism in favour of a sophisticated realism about physical objects. This still gives priority to our experiences, now called percepts, but the existence of physical objects is postulated to explain the coherence and consistency of our percepts. Ayer continued to deny that there were any natural necessities, analysing causation as consisting in law-like regularities. He used this analysis to defend a compatibilist position about free action, claiming that a free action is to be contrasted with one done under constraint or compulsion. Causation involves mere regularity, and so neither constrains nor compels.

Analyticity and the A Priori

1992 ◽  
Vol 18 ◽  
pp. 113-150
Author(s):  
Albert Casullo
Keyword(s):  
Twentieth Century ◽  
A Priori ◽  
Logical Empiricism ◽  
The Other ◽  
A Priori Knowledge ◽  
Other Hand ◽  
Priori Knowledge

The analytic/synthetic distinction has played a central role in discussions of a priori knowledge throughout the twentieth century. One of the primary reasons for the prominence of this distinction is the widespread influence of the tradition of logical empiricism which endorsed the following principles:(LEl) All analytic propositions are knowable a prioriand(LE2) All propositions knowable a priori are analytic.Hence, proponents of the a priori often argue in support of the contention that the propositions of a particular discipline, say mathematics or logic, are knowable a priori by arguing that it consists solely of analytic propositions. On the other hand, detractors of the a priori often reject such knowledge on the grounds that the analytic/synthetic distinction is not cogent. My primary goal in this paper is to challenge the prevalent acceptance of (LE1).

scholarly journals Apriority and Essential Truth

Metaphysica ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 1-8
Author(s):  
Tristan Grøtvedt Haze
Keyword(s):  
A Priori ◽  
Epistemic Status ◽  
Empirical Knowledge ◽  
Recent Philosophy ◽  
Tight Connection ◽  
And Mathematics ◽  
In Virtue Of

AbstractThere is a line of thought, neglected in recent philosophy, according to which a priori knowable truths such as those of logic and mathematics have their special epistemic status in virtue of a certain tight connection between their meaning and their truth. Historical associations notwithstanding, this view does not mandate any kind of problematic deflationism about meaning, modality or essence. On the contrary, we should be upfront about it being a highly debatable metaphysical idea, while nonetheless insisting that it be given due consideration. From this standpoint, I suggest that the Finean distinction between essence and modality allows us to refine the view. While liberal about meaning, modality and essence, the view is not without bite: it is reasonable to suppose that it is able to ward off philosophical confusions stemming from the undue assimilation of a priori to empirical knowledge.

Denial of the Synthetic A Priori

Philosophy ◽  
1960 ◽  
Vol 35 (134) ◽  
pp. 255-264 ◽  
Author(s):  
Oliver A. Johnson
Keyword(s):  
Twentieth Century ◽  
A Priori ◽  
Logical Empiricism ◽  
Philosophical Tradition ◽  
A Priori Knowledge ◽  
A Posteriori ◽  
Logical Empiricist ◽  
Traditional Philosophy ◽  
Synthetic A Priori ◽  
Logical Impossibility

In his essay “Logical Empiricism”, in the anthology Twentieth Century Philosophy, Professor Feigl writes: “All forms of empiricism agree in repudiating the existence of synthetic a priori knowledge.” 2 Schlick makes the same point even more forcibly: “The empiricism which I represent believes itself to be clear on the point that, as a matter of principle, all propositions are either synthetic a posteriori or tautologous; synthetic a priori propositions seem to it to be a logical impossibility.”3 The denial of synthetic a prioris is a major thesis of the logical empiricist position, being found in the writings of most of the leaders of the movement.4 The reason for its importance is fairly clear. It provides a formula on which the empiricists can base their critique of traditional philosophy. To use Ayer's phrase, denial of the synthetic a priori results in “the elimination of metaphysics”. The philosophical tradition to which the empiricists are opposed and whose “metaphysics” they wish to eliminate can be called, somewhat loosely, rationalism.

scholarly journals Two Kindred Neo-Kantian Philosophies of Science: Pap’s The A Priori in Physical Theory and Cassirer’s Determinism and Indeterminism in Modern Physics

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Thomas Mormann
Keyword(s):  
Philosophy Of Science ◽  
20Th Century ◽  
Physical Theory ◽  
A Priori ◽  
Logical Empiricism ◽  
Main Thesis ◽  
Modern Physics ◽  
Continental Tradition ◽  
Determinism And Indeterminism ◽  
Kantian Philosophy

Abstract The main thesis of this paper is that Pap’s The Functional A Priori in Physical Theory and Cassirer’s Determinism and Indeterminism in Modern Physics may be conceived as two kindred accounts of a late Neo-Kantian philosophy of science. They elucidate and clarify each other mutually by elaborating conceptual possibilities and pointing out affinities of neo-Kantian ideas with other currents of 20th century’s philosophy of science, namely, pragmatism, conventionalism, and logical empiricism. Taking into account these facts, it seems not too far fetched to conjecture that under more favorable circumstances Pap could have served as a mediator between the “analytic” and “continental” tradition thereby overcoming the dogmatic dualism of these two philosophical currents that has characterized philosophy in the second half the 20th century.

Pragmatic Reconstruction in Jurisprudence: Features of a Realistic Legal Theory

2021 ◽  
Vol 34 (1) ◽  
pp. 171-202
Author(s):  
Brian Z. Tamanaha
Keyword(s):  
Twentieth Century ◽  
Coercive Force ◽  
Social Life ◽  
Conceptual Analysis ◽  
Legal Theory ◽  
A Priori ◽  
Planning System ◽  
Universal Feature ◽  
Moral Problems ◽  
Theory Of Law

A century ago the pragmatists called for reconstruction in philosophy. Philosophy at the time was occupied with conceptual analysis, abstractions, a priori analysis, and the pursuit of necessary, universal truths. Pragmatists argued that philosophy instead should center on the pressing problems of the day, which requires theorists to pay attention to social complexity, variation, change, power, consequences, and other concrete aspects of social life. The parallels between philosophy then and jurisprudence today are striking, as I show, calling for a pragmatism-informed theory of law within contemporary jurisprudence. In the wake of H.L.A. Hart’s mid-century turn to conceptual analysis, “during the course of the twentieth century, the boundaries of jurisprudential inquiry were progressively narrowed.”1 Jurisprudence today is dominated by legal philosophers engaged in conceptual analysis built on intuitions, seeking to identify essential features and timeless truths about law. In the pursuit of these objectives, they detach law from its social and historical moorings, they ignore variation and change, they drastically reduce law to a singular phenomenon—like a coercive planning system for difficult moral problems2—and they deny that coercive force is a universal feature of law, among other ways in which they depart from the reality of law; a few prominent jurisprudents even proffer arguments that invoke aliens or societies of angels.

scholarly journals Points of convergence between logical empiricism and inductive metaphysics: Hans Reichenbach and Erich Becher in comparison

Synthese ◽  
2021 ◽  
Author(s):  
Ansgar Seide
Keyword(s):  
20Th Century ◽  
19Th Century ◽  
Vienna Circle ◽  
External World ◽  
Logical Empiricism ◽  
Natural Sciences ◽  
Early 20Th Century ◽  
Late 19Th Century ◽  
Hans Reichenbach

AbstractIn this paper, I take a closer look at Hans Reichenbach’s relation to metaphysics and work out some interesting parallels between his account and that of the proponents of inductive metaphysics, a tradition that emerged in the mid- and late 19th century and the early 20th century in Germany. It is in particular Hans Reichenbach’s conception of the relation between the natural sciences and metaphysics, as displayed in his treatment of the question of the existence of the external world, that shows some very interesting similarities with inductive metaphysics. By a comparison with the position of the inductive metaphysician Erich Becher and his handling of the problem of realism, I work out the parallels between Reichenbach’s program and inductive metaphysics. I come to the conclusion that while there are certainly some respects in which Reichenbach’s logical empiricism is closer to the positions of the representatives of the Vienna Circle, it turns out that with regard to his views on metaphysics there is a greater affinity with the program of inductive metaphysics.

Sign in / Sign up

Export Citation Format

Share Document