Get this from a library! El positivismo lógico. [A J Ayer; L Aldama; U Frisch; C N Molina; et al]. Alfred Jules Ayer El positivismo Lógico. 2 likes. Book. Buy Positivismo lógico, el by Alfred Julius Ayer, L. Aldama (ISBN: ) from Amazon’s Book Store. Everyday low prices and free delivery on eligible.

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I am using it here in such a way that to say of an object that it is perceived does not entail saying that it exists in any sense at all.

The Foundations of Empirical Knowledge In other words, the truths of logic and mathematics are analytic propositions or tautologies. Marshall McLuhan 9 – I’m afraid I’m going to have to revise all my various books and opinions. But these principles must be obtained inductively.

Frases de Alfred Jules Ayer

Henri Matisse 3 – We infer the existence of events which we are not actually observing, with the help of general principle. The criterion which we use to test the genuineness of apparent statements of fact is the criterion of verifiability.

The principles of logic and mathematics are true simply because we never allow them to be anything else. For if there are any questions which science leaves it to philosophy to answer, a straightforward process of elimination must lead to their discovery.

If there is thought to be a difficulty here, it is perhaps because there is also a correct and familiar usage of the word “perceive”, in which to say of an object that it lpgico perceived does carry the implication that it exists.


There are only two ways of approaching this problem on the assumption that it is a genuine problem, and it is easy to see that neither of them can lead to its solution.

Frases de Alfred Jules Ayer (19 citações) | Citações e frases famosas

As Hume conclusively showed, no one event intrinsically points to any other. Let us call a proposition which records an actual or possible observation an experiential proposition. The problem of induction is, roughly speaking, the problem of finding a way to prove that certain empirical generalizations which are derived from past experience will hold good also in the future.

It is as if I had written “Stealing money!! Maksim Litvinov 1 – And, consequently, any attempt to base a deductive system on propositions which describe what is immediately given is bound to be a failure. The surest way to end them is to establish beyond question what should be the ajer and method of a philosophical enquiry.

And this is a perfectly correct and familiar usage of the word.

And this is by no means so difficult a task as the history of philosophy would lead one to suppose. A Life by Ben Rogers, p.

John Stuart Mill I am using the word “perceive”. The traditional disputes of philosophers are, for the most part, as unwarranted as they are unfruitful.

Autores parecidos Ludwig Wittgenstein A Lifep. Willard Van Orman Quine 6.


To make our position clearer, we may formulate it in another way. Then we may say that it is the mark of a genuine factual proposition, not that it should be equivalent to an experiential proposition, or any finite number of experiential propositions, but simply that some experiential propositions can be deduced from it in ppositivismo with certain other premises without being deducible from those other premises alone.

Jeremy George, in [http: Frases de Alfred Jules Ayer. And the reason for this is that we cannot abandon them without contradicting ourselves, without sinning against the rules which govern the use of language, and so making our utterances self-stultifying. We say that a sentence is factually significant to any given person, if, and logixo if, he knows how to verify the proposition which it purports to express — that is, if he knows what observations would lead him, under certain conditions, to accept the proposition as being true, or reject it as being false.

By mere deduction from what is positiviamo given we cannot advance a single step beyond.