Skip to main content

Part of the book series: Vienna Circle Institute Library [2003] ((VCIL,volume 2))

Abstract

During his long career, Rudolf Carnap held various different views about the concept of truth and its philosophical significance. As a good logical empiricist, he insisted on the distinction between logical and factual statements, and employed his technical powers to give rigorous characterizations of the notions of logical, analytic, and factual truth. The development of Carnap’s views reflected his ability to quickly absorb new influences and his broad interests ranging from logic to epistemology, philosophy of language, and philosophy of science (Sections 1 and 2). Carnap was the co-founder of logical semantics with Alfred Tarski (Section 3), and therefore it is especially interesting to see how Carnap’s work was related to Tarski’s early definition of truth and to the later Tarskian model theory (Section 4). In Section 5, we discuss some difficulties in Carnap’s liberally empiricist treatment of scientific theories. The final section 6 makes some remarks on Carnap’s contemporary relevance.

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Chapter
USD 29.95
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
eBook
USD 84.99
Price excludes VAT (USA)
  • Available as EPUB and PDF
  • Read on any device
  • Instant download
  • Own it forever
Softcover Book
USD 109.99
Price excludes VAT (USA)
  • Compact, lightweight edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info
Hardcover Book
USD 109.99
Price excludes VAT (USA)
  • Durable hardcover edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Institutional subscriptions

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Notes

  1. For a survey, see Ilkka Niiniluoto, “Theories of Truth: Vienna, Berlin, and Warsaw”, in: Jan Wolenski, Eckehart Köhler (eds.), Alfred Tarski and the Vienna Circle, Dordrecht: Kluwer, 1999, pp. 17–26.

    Google Scholar 

  2. See J. Alberto Coffa, The Semantic Tradition from Kant to Carnap: To the Vienna Station, Cambridge: Cambridge University Press, 1991;

    Book  Google Scholar 

  3. Alan W. Richardson, Carnap’s Construction of the World: The Aufbau and the Emergence of Logical Empiricism, Cambridge: Cambridge University Press, 1998;

    Google Scholar 

  4. Michael Friedman, Reconsidering Logical Positivism, Cambridge: Cambridge University Press, 1999. For Carnap’s own statement of his aims, see the Preface to The Logical Structure of the World & Pseudoproblems in Philosophy, Berkeley and Los Angeles: University of California Press, 1967.

    Book  Google Scholar 

  5. Eino Kaila stated in 1930 that “the constitution theory is supposed to be a ‘rational reconstruction’ of the actual cognitive process”. See E. Kaila, Experience and Reality, Dordrecht: D. Reidel, 1979, p. 19.

    Book  Google Scholar 

  6. See Carnap, op. cit., pp. 325–327.

    Google Scholar 

  7. See Rudolf Carnap, “Intellectual Autobiography”, in: Paul Arthur Schilpp (ed.), The Philosophy of Rudolf Carnap, La Salle: Open Court, 1963, p. 29.

    Google Scholar 

  8. See Jaakko Hintikka, Lingua Universalis vs. Calculus Ratiocinator: An Ultimate Presupposition of Twentieth-Century Philosophy, Dordrecht: Kluwer, 1997.

    Book  Google Scholar 

  9. Carnap maintained this Fregean idea even in his later work in semantics.

    Google Scholar 

  10. See Rudolf Carnap, Abriss der Logistik, Wien: Julius Springer, 1929, p. 3.

    Google Scholar 

  11. For accounts of this manuscript, see Coffa, op.cit., pp. 273–280; S. Adowey, A.W. Cams, “Carnap, Completeness, and Categoricity: The Gabelbarkeitssatz of 1928”, Erkenntnis 54, 2001, pp. 145–172. Carnap presented his paper on “Axiomatik” at the Prague Conference on September 1929, and its brief summary was published in Erkenntnis 1, 1930, pp. 303–307. The manuscript has recently been edited by Thomas Bonk and Jesus Mosterin, and published as Untersuchungen zur allgemeinen Axiomatik. Darmstadt: Wissenschafliche Buchgesellschaft, 2000.

    Article  Google Scholar 

  12. See Kurt Gödel, Collected Works, Vol. I, Oxford: Oxford University Press, 1986, p. 63.

    Google Scholar 

  13. Carnap’s relations to Tarski are described in his “Intellectual Autobiography”, op. cit., p. 31.

    Google Scholar 

  14. See Rudolf Carnap, The Logical Syntax of Language, London: Routledge & Kegan Paul, 1937. For Carnap’s lectures on metalogic in 1931, see

    Google Scholar 

  15. Friedrich Stadler, The Vienna Circle: Studies in the Origins, Development, and Influence of Logical Empiricism, Wien: Springer, 2001, pp. 279–299.

    Google Scholar 

  16. See Moritz Schlick, Philosophical Papers, vol. II, Dordrecht: D. Reidel, 1979, p. 400.

    Google Scholar 

  17. See Thomas E. Uebel, “Rational Reconstruction as Elucidation? Carnap in the Early Protocol Sentence Debate”, Synthese 93, 1992, pp. 107–140.

    Article  Google Scholar 

  18. See Carl G. Hempel, “On the Logical Positivists’ Theory of Truth”, in: Analysis 2, 1935, pp. 49–59;

    Google Scholar 

  19. Michael Friedman, “Hempel and the Vienna Circle”, in: James Fetzer (ed.), Science, Explanation, and Rationality: Aspects of the Philosophy of Carl G. Hempel, Dordrecht: Kluwer, 2000, p. 49.

    Google Scholar 

  20. For discussions of Carnap’s definition of analytic truth in his Syntax, see Coffa, op.cit., pp. 286–305; Richard Creath, “The Unimportance of Semantics”, in: Arthur Fine, Michael Forbes, Linda Wessels (eds.), PSA 1990, vol. 2, East Lansing: Philosophy of Science Association, 1991, pp. 405–416;

    Google Scholar 

  21. Sahotra Sarkar, “‘The Boundless Ocean of Unlimited Possibilities’: Logic in Carnap’s Logical Syntax of Language”, Synthese 93, 1992, pp. 191–237;

    Article  Google Scholar 

  22. Thomas Oberdan, “The Concept of Truth in Carnap’s Logical Syntax of Language, Synthese 93, 1992, pp. 239–260;

    Article  Google Scholar 

  23. David Devidi, Graham Solomon, “Tolerance and Metalanguage in Carnap’s Logical Syntax of Language, Synthese 103, 1995, pp. 123–139.

    Google Scholar 

  24. See S.C. Kleene, “Review of Rudolf Carnap, The Logical Syntax of Language”, Journal of Symbolic Logic 4, 1939, pp. 82–87.

    Article  Google Scholar 

  25. For the English translation, “The Concept of Truth in Formalized Languages”, see Alfred Tarski, Logic, Semantics, Metamathematics, Oxford: Oxford University Press, 1956, pp. 152–278.

    Google Scholar 

  26. See R. Carnap, “Intellectual Autobiography”, op.cit., pp. 60–61.

    Google Scholar 

  27. See Rudolf Carnap, “Wahrheit und Bewärung”, in: Actes du Congrès International de Philosophie Scientifique, Sorbonne, Paris 1935, Paris: Hermann, 1936, pp. IV. 19–23. The expanded English translation, “Truth and Confirmation”, is published in Herbert Feigl, Wilfrid Sellars (eds.), Readings in Philosophical Analysis, New York: Appleton-Century-Crofts, 1949, pp. 119–127.

    Google Scholar 

  28. See Carl G. Hempel, “Some Remarks on Tacts’ and ‘Propositions’”, Analysis 2, 1935, pp. 93–96.

    Google Scholar 

  29. Cf. M. Friedman, “Hempel and the Vienna Circle”. Material related to this debate can be found in the Otto Neurath Nachlass.

    Google Scholar 

  30. See Rudolf Carnap, “Testability and Meaning”, Philosophy of Science 3, 4, 1936, pp. 419– 471;

    Article  Google Scholar 

  31. See Rudolf Carnap, “Testability and Meaning”, Philosophy of Science 4, 1, 1937, pp. 1–40.

    Article  Google Scholar 

  32. See Rudolf Carnap, “Remarks on Induction and Truth”, Philosophy and Phenomenological Research 6, 4, 1946, pp. 590–602, 609–611. See also “Truth and Confirmation”, op. cit.

    Article  Google Scholar 

  33. See Rudolf Carnap, Foundations of Logic and Mathematics, Chicago: The University of Chicago Press, 1939.

    Google Scholar 

  34. See Rudolf Carnap, Introduction to Semantics, Cambridge, MS: Harvard University Press, 1942.

    Google Scholar 

  35. See Rudolf Carnap, Meaning and Necessity: A Study in Semantics and Modal Logic, Chicago: The University of Chicago Press, 1947. Second expanded edition, 1956.

    Google Scholar 

  36. See Rudolf Carnap, Logical Foundations of Probability, Chicago: The University of Chicago Press, 1950.

    Google Scholar 

  37. See John G. Kemeny, “A Logical Measure Function”, Journal of Symbolic Logic 18, 1953, pp. 289–308.

    Article  Google Scholar 

  38. See Rudolf Carnap, Richard Jeffrey (eds.), Studies in Inductive Logic and Probability, Vol. 1, Berkeley: University of California Press, 1971.

    Google Scholar 

  39. See Jaakko Hintikka, “Modality as Referential Multiplicity”, Ajatus 20, 1957, pp. 49–64;

    Google Scholar 

  40. Ghita Holmström-Hintikka, Sten Lindström, Rysiek Sliwinski (eds.), Collected Papers of Stig Ranger with Essays on his Life and Works I–II, Dordrecht: Kluwer, 2001.

    Google Scholar 

  41. This is convincingly argued in Jaakko Hintikka, “Carnap’s Heritage in Logical Semantics”, in: Jaakko Hintikka (ed.), Rudolf Carnap, Logical Empiricist, Dordrecht: D. Reidel, 1975, pp. 217–242. Hintikka states that Carnap was “the first and foremost herald of a new epoch of possible-worlds semantics”, but also argues that Carnap failed to interpret his models “as genuine possible worlds, i.e. real-life alternatives to our actual world”. It is no doubt philosophically significant whether possible worlds are understood “realistically”. But it is fair to Carnap to point out that most studies in this field have assumed that possible worlds are in some way relative to language — or even can be represented by linguistic expressions (e.g. Carnap’s state descriptions, Hintikka’s model sets and constituents). Note that Hintikka distinguishes the issues of realism and completeness of possible words, and he has allowed that possible worlds are replaced by “small worlds”.

    Google Scholar 

  42. See Rudolf Carnap, “Meaning and Synonymy in Natural Languages”, Philosophical Studies 6, 3, 1955, pp. 33–47. Reprinted in Meaning and Necessity, 2nd edn., op.cit., 1956.

    Article  Google Scholar 

  43. See Hintikka, “Carnap’s Heritage”, p. 236.

    Google Scholar 

  44. Carnap’s “Notes in Semantics” is mentioned in the Bibliography of the Schilpp volume, op. cit., 1963, p. 1045. See also Rudolf Carnap, “Replies and Systematic Expositions”, in: Schilpp, op. cit., pp. 889–905.

    Google Scholar 

  45. Hintikka points out that Carnap allows descriptive predicates to be “arbitrarily reinterpreted” in different ways in his models. However, if the function deseqr is a part of a semantical system, it in any case assigns extensions to the same predicate in different models.

    Google Scholar 

  46. See Jan Wolehski, Peter Simons, “De Veritate: Austro-Polish Contributions to the Theory of Truth from Brentano to Tarski”, in: Klemens Szaniawski (ed.), The Vienna Circle and the Lvow-Warsaw School, Dordrecht: Kluwer, 1989, pp. 391–442.

    Chapter  Google Scholar 

  47. See Jan Wolehski, “Theories of Truth in Austrian Philosophy”, Reports on Philosophy 18, 1998, pp.13–49.

    Google Scholar 

  48. See A. Tarski, “The Concept of Truth”, pp. 166–167.

    Google Scholar 

  49. Ibid., pp. 199, 207, 239.

    Google Scholar 

  50. See Ilkka Niiniluoto, “Tarskian Truth as Correspondence — Replies to Some Objections”, in: Jaroslaw Peregrin (ed.), Truth and its Nature (if any), Dordrecht: Kluwer, 1999, pp. 91–104.

    Chapter  Google Scholar 

  51. See Alfred Tarski, “The Semantic Concept of Truth and the Foundations of Semantics”, Philosophy and Phenomenological Research 4, 1944, pp. 341–376.

    Article  Google Scholar 

  52. See also Alfred Tarski, “Truth and Proof”, Scientific American 6, 1969, pp. 63–77.

    Article  Google Scholar 

  53. See Alfred Tarski, Robert Vaught, “Arithmetical Extensions of Relational Systems”, Compositio Mathematicae 13, 1957, pp. 81–102.

    Google Scholar 

  54. See Wilfrid Hodges, “Truth in a Structure”, Proceedings of the Aristotelian Society 86, 1986, pp. 135–152.

    Google Scholar 

  55. See Alfred Tarski, “On the Concept of Logical Consequence”, in: Logic, Semantics, Metamathematics, Oxford: Oxford University Press, 1956, pp. 416–417. The same definition is repeated in Sections 37–38 of

    Google Scholar 

  56. A. Tarski, Introduction to Logic and to the Methodology of the Deductive Sciences, Oxford: Oxford University Press, 1941.

    Google Scholar 

  57. Tarski added that this situation occurs only in those cases where a theory can be given several alternative interpretations but we do not wish to give a preference to one of them. See Introduction to Logic, 3rd edn, 1965, p. 129. Hodges discussed this issue in a lecture given in the Tarski Centennial Conference in Warsaw, May 2001. See also Ilkka Niiniluoto, “Tarski’s Definition and Truth-Makers”, forthcoming in the Proceedings of the Tarski Centennial Conference.

    Google Scholar 

  58. Another influential figure was Alonzo Church at Princeton. An important summary of the “logistic method” was given in his Introduction to Logic, vol. 1, Princeton: Princeton University Press, 1956. (The shorter first edition appeared in 1944.) Church’s students John Kemeny and Leon Henkin made important contributions to model theory. Henkin’s 1947 completeness proof used a method where a model of a theory is constructed from the individual constants of its language. He did not mention Carnap’s similar intralinguistic method of valuation in The Logical Syntax, however. See L. Henkin, “The Discovery of My Completeness Proofs”, The Bulletin of Symbolic Logic 2, 1996, pp. 127–158.

    Article  Google Scholar 

  59. See R. Carnap, “Intellectual Autobiography”, p. 79.

    Google Scholar 

  60. See R. Carnap, Introduction to Semantics, p. vii.

    Google Scholar 

  61. This issue was discussed by Carnap and Tarski already in 1930. See R. Carnap, “Intellectual Autobiography”, p. 30.

    Google Scholar 

  62. See, for example, J.D. Monk, Mathematical Logic, New York: Springer-Verlag, 1976.

    Google Scholar 

  63. See Hartry Field, “Tarski’s Theory of Truth”, Journal of Philosophy 69, 1972, pp. 347–375.

    Article  Google Scholar 

  64. See A. Tarski, “The Concept of Truth”, p. 188.

    Google Scholar 

  65. See R.L. Kirkham, Theories of Truth: A Critical Introduction, Cambridge, MS: MIT Press 1992, p. 132. Kirkham’s schema differs slightly from (C), since it replaces proposition p by a state of affairs.

    Google Scholar 

  66. See Rudolf Carnap, “Replies and Systematic Expositions”, in: Paul Arthur Schilpp (ed.), The Philosophy of Rudolf Carnap, La Salle: Open Court, 1963, p. 901.

    Google Scholar 

  67. See Rudolf Carnap, Physikalische Begriffsbildung, Karlsruhe in Baden: G. Braun, 1926, p. 45.

    Google Scholar 

  68. See Ernest Nagel, The Structure of Science, Indianapolis: Hackett, 1961.

    Google Scholar 

  69. For my own formulations and defences of scientific realism, see Ilkka Niiniluoto, Truthlike-ness, Dordrecht: D. Reidel 1987;

    Book  Google Scholar 

  70. For my own formulations and defences of scientific realism, see Ilkka Niiniluoto, Critical Scientific Realism, Oxford: Oxford University Press, 1999.

    Google Scholar 

  71. See R. Carnap, Foundations of Logic and Mathematics, p. 62. This point was repeated by Hempel in the Schilpp volume. He added that, even though theoretical existential hypotheses might have factual reference and truth conditions, their translation to the metalanguage does not help us to understand the theory, unless the metalanguage is antecedently understood. Here the motivation for the partial interpretation view is epistemological rather than semantical. See Carl G. Hempel, “Implications of Carnap’s work for the Philosophy of Science”, in: P.A. Schilpp (ed.), The Philosophy of Rudolf Carnap, 1963, pp. 695–696.

    Google Scholar 

  72. See Fred Suppe (ed.), The Structure of Scientific Theories, 2nd edn., Urbana: University of Illinois Press, 1977. Most influential in this development was Carnap’s article “The Methodological Character of Theoretical Concepts”, in: Herbert Feigl and Michael Scriven (eds.), The Foundations of Science and and the Concepts of Psychology and Psychoanalysis, Minneapolis: University of Minnesota Press, 1956, pp. 38–76.

    Google Scholar 

  73. See Herbert Feigl, “Existential Hypotheses: Realistic versus Phenomenalistic Interpretations”, Philosophy of Science 17, 1950, pp. 35–62. Feigl had already in the 1935 Congress in Paris discussed the possibility of giving a naturalist and empiricist interpretation of scientific realism.

    Article  Google Scholar 

  74. See Herbert Feigl, “Sense and Nonsense in Scientific Realism”, in: Actes du Congrès International de Philosophie Scientifique, Paris: Hermann, 1936, pp. III.50–56.

    Google Scholar 

  75. For a detailed assessment of Carnap’s “neutralism”, see Ch. 3 of Stathis Psillos, Scientific Realism: How Science Tracks Truth, London: Routledge, 1999. See also Wesley Salmon, “Carnap, Hempel and Reichenbach on Scientific Realism”, in: Wesley Salmon and Gereon Wolters (eds.), Logic, Language and the Structure of Scientific Theories, Pittsburgh: University of Pittsburgh Press, pp. 237–254; Paolo Parrini; “With Carnap, Beyond Carnap: Metaphysics, Science, and the Realism/Instrumentalism Controversy”, ibid., pp. 255–277. Carnap’s position as a “structural realist” is discussed by Stathis Psillos, “Carnap, the Ramsey Sentence and Realistic Empiricism”, Erkenntnis 52, 2000, pp. 253–279.

    Google Scholar 

  76. See Carnap, “Intellectual Autobiography”, p. 79.

    Google Scholar 

  77. See Rudolf Carnap, “Empiricism, Semantics and Ontology”, Revue Internationale de Philosophie 4, 1950, pp. 20–40. Reprinted in Meaning and Necessity, 1956.

    Google Scholar 

  78. See Carnap, “Intellectual Autobiography”, p. 46.

    Google Scholar 

  79. See Rudolf Carnap, An Introduction to the Philosophy of Science, edited by Martin Gardner, New York: Basic Books, 1974, p. 256. The book is originally based on Carnap’s lecture course in the fall of 1958.

    Google Scholar 

  80. See R. Carnap, Logical Foundations of Probability, 2nd edn, 1962, pp. 572–575.

    Google Scholar 

  81. See Jaakko Hintikka, Ilkka Niiniluoto, “An Axiomatic Foundation for the Logic of Inductive Generalization”, in: Richard Jeffrey (ed.), Studies in Inductive Logic and Probability, vol. 2, Berkeley and Los Angeles: University of California Press, 1980, pp. 157–181. The role of theories and theoretical concepts in inductive inference is studied in

    Google Scholar 

  82. Ilkka Niiniluoto, Raimo Tuomela, Theoretical Concepts and Hypothetico-Inductive Inference, Dordrecht: D. Reidel, 1973.

    Book  Google Scholar 

  83. See Carl G. Hempel, “The Theoretician’s Dilemma: A Study in the Logic of Theory Construction”, in: Herbert Feigl, Michael Scriven, Grower Maxwell (eds.), Concepts, Theories and the Mind-Body Problem, Minneapolis: University of Minnesota Press, 1958, pp. 37–98.

    Google Scholar 

  84. See Rudolf Carnap, “Beobachtungssprache und theoretische Sprache”, Dialectica 12, 1958, pp. 236–248: English translation “Observational Language and Theoretical Language”, in: Jaakko Hintikka (ed.), Rudolf Carnap, Logical Empiricist, 1975, pp. 75–85.

    Article  Google Scholar 

  85. See John A. Winnie, “Theoretical Analyticity”, in J. Hintikka (ed.), Rudolf Carnap, Logical Empiricist, 1975, pp. 143–159;

    Google Scholar 

  86. Raimo Tuomela, Theoretical Concepts, Wien: Springer, 1973.

    Book  Google Scholar 

  87. See Niiniluoto, Critical Scientific Realism; Psillos, Scientific Realism. Historically speaking, Carnap’s insistence on finding the analytic component of a given theory can be traced to the doctrine of “relativized a priori”.

    Google Scholar 

  88. See R. Carnap, Introduction to the Philosophy of Science, 1974, p. 268.

    Google Scholar 

  89. See R. Carnap, “Observational Language and Theoretical Language”, pp. 80–81.

    Google Scholar 

  90. See R. Carnap, “Replied and Systematic Expositions”, 1963, pp. 963.

    Google Scholar 

  91. This is the main point of the article by Jaakko Hintikka and Ilkka Niiniluoto, “On Theoretical Terms and Their Ramsey-Elimination”, published (only) as a Russian translation in Filosofskiye Nauki 1973, pp. 49–61. Recall that a standard interpretation of second-order logic allows the one-place predicate variables to range over all subsets of the domain. So one way of ontologically specifying a non-standard interpretation is to require that the members of a permissible subset share a common physical property.

    Google Scholar 

  92. See Rudolf Carnap, “Von der Erkenntnistheorie zur Wissenschaftslogik”, in: Actes du Congrès International de Philosophie Scientifique, Paris: Hermann, 1936, p. 40.

    Google Scholar 

  93. See R. Carnap, “Replies and Systematic Expositions”, 1963, p. 870.

    Google Scholar 

  94. See R. Carnap, The Logical Structure of the World, 1967, p. xi.

    Google Scholar 

  95. See Hilary Putnam, Reason, Truth, and History, Cambridge: Cambridge University Press, 1981.

    Book  Google Scholar 

  96. A.W. Carus claims that Carnap did not “switch to a correspondence theory of truth after 1935”, since his “linguistic pluralism eliminates talk of “reality” outside the framework of a particular language”. See A.W. Carus, “Carnap, Syntax and Truth”, in: Jarostaw Peregrin (ed.), Truth and its Nature (if any), Dordrecht: Kluwer, 1999, pp. 15–35. I prefer to read Carnap and Tarski so that their semantics successfully combines correspondence theory with linguistic pluralism.

    Chapter  Google Scholar 

  97. See, for example, the comments on the relations between Carnap and Thomas Kuhn in John Earman, “Carnap, Kuhn, and the Philosophy of Scientific Methodology”, in: Paul Horwich (ed.), World Changes: Thomas Kuhn and the Nature of Science, Cambridge, MS: The MIT Press, 1993, pp. 9–36.

    Google Scholar 

  98. For pioneering works in this area, see Marian Przetcki, The Logic of Empirical Theories, London: Routledge and Kegan Paul, 1969;

    Google Scholar 

  99. Patrick Suppes, Studies in the Methodology and Foundations of Science: Selected Papers from 1951 to 1969, Dordrecht: D. Reidel, 1969.

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Editor information

Editors and Affiliations

Rights and permissions

Reprints and permissions

Copyright information

© 2003 Springer Science+Business Media Dordrecht

About this chapter

Cite this chapter

Niiniluoto, I. (2003). Carnap on Truth. In: Bonk, T. (eds) Language, Truth and Knowledge. Vienna Circle Institute Library [2003], vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0151-8_1

Download citation

  • DOI: https://doi.org/10.1007/978-94-017-0151-8_1

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-90-481-6258-1

  • Online ISBN: 978-94-017-0151-8

  • eBook Packages: Springer Book Archive

Publish with us

Policies and ethics