Braithwaite R. B., Russell Bertrand, Waismann Friedrich. The Relevance of Psychology to Logic: A Symposium. Aristotelian Society. Verifiability · F. Waismann. In Gilbert Ryle & Antony Flew (eds.), Journal of The Principle of Lazerowitz – – Mind 46 () Friedrich Waismann. Verifiability (Part II of a symposium). Aristotelian Society, supplementary volume XIX (), pp. – – Volume

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A statement which cannot be verified conclusively is not verifiable at all; it is just devoid of any meaning. Lloyd – – Aristotelian Society Supplementary Volume 42 1: Was Carnap a Complete Verificationist in the Aufbau?

This, apparently, would be a psychological claim, to the effect that we are capable of types of experience other than those we usually associate with the normal functioning of our sense organs. Lloyd – waismanm Aristotelian Society Supplementary Volume But then, if the possibility of mystical or religious experiences is allowed, it seems that at least some metaphysical statements are verifiable and therefore meaningful.

The Semantic Tradition from Kant to Carnap. Science Logic and Mathematics. Cognitive Meaning and Cognitive Use.

F. Waismann, Verifiability – PhilPapers

As Waismanb explains, dispositional terms may be introduced by means of “reduction sentences,” and the theoretical constructs of the more advanced sciences for example, “electrical field,” vrrifiability temperature,” “gravitational potential” can be accommodated by allowing the language to include interpreted deductive systems.

Difficulties of the kind raised by Hempel and Church obtain when a component of a molecular statement is superfluous as far as the verifiability of the molecular statement is concerned, that is, when the inclusion or exclusion of the component makes no difference to the verifiable entailments of the molecular statement.

In some of the earlier formulations of the verifiability principle it is presented as a criterion for distinguishing between meaningful and meaningless propositions. Carnap is waosmann concerned in these articles with giving a technical account of the formal features of such languages.


Logic and Philosophy of Logic. Lodder – – Artificial Intelligence and Law 2 2: Consequently, it is said, it is not possible to give a general criterion of the meaningfulness of a sentence.

See also Basic Statements ; Logical Positivism. In either case, there is the difficulty of explaining how these statements are related to the experiences that would verify them. Furthermore, the rules governing the correct use of different kinds of words differ enormously, and hence there is not just one way of misusing the words that occur in a sentence and thereby rendering the sentence meaningless.

Langford – – Journal of Symbolic Logic 5 1: Friedrich Waismann – – Routledge. The qualification concerning additional premises is introduced to allow, among other things, theoretical statements in science to be verifiable. But, as we have seen, if the verifiability principle is simply a contingent statement about a certain linguistic usage, its logical status cannot justify the degree of confidence that its adherents place in it.


For if N is any meaningless statement and O some observation statement, then from N together with the additional premise if N then O the observation statement O can be deduced, although O cannot be deduced from the additional premise alone.

What is the Verifiability Criterion a Criterion Of? The question whether a statement reporting an empirical observation is conclusively verifiable is, as we have seen, of importance for the criterion of conclusive verifiability and for that of conclusive falsifiability.

The fourth criterion is the most liberal and admits into the class of meaningful statements empirical statements of the various kinds that were excluded by the requirement of conclusive verifiability or the requirement of conclusive falsifiability. An waosmann predicate is, by definition, one that stands for a property that can be observed or experienced.


If basic observation statements can be formulated in the required way, they express logically possible evidence, and hence any statement suitably related to a set of observation statements is verifiable in principle, even though no one is ever in a position to have the relevant experiences, that is, to verify the statement in question.

Richard Creath – – PSA: A principle that expresses a linguistic recommendation is no doubt closely related to a corresponding analytic statement, but the recommendation itself is not tautological and uninformative.

University of Illinois Press, And finally, if the meaning of a sentence were identified with the experiences of a particular person, the verifiability principle would result in a radical form of solipsism.

Added to PP index Total downloads 85 77, of 2, Recent downloads 6 months 8 65, of 2, How can I increase my downloads? A recommendation or a decision has a different logical status; it is not successful by being true or unsuccessful by being false.

In order to meet these difficulties, sentences, statements, and propositions may be distinguished in the following way: Barnes – – Philosophy 14 University of Notre Dame Press, But this formulation, as Ayer recognizes in the second edition of his book, permits any meaningless statement to be verifiable. The antimetaphysical import of the verifiability principle, he may say, is apparently based on the assumption that we cannot have experiences radically different in kind from those that we now have.

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