“The fundamental thesis of ordinary conventionalism, represented for instance by Poincare, states that there are problems which cannot be solved by appeal to experience unless one introduces a certain convention, since only such a convention, together with experimental data, makes it possible to solve the problem in question. The judgements which combine to make up such a solution are thus not forced on us by empirical data alone, but their adoption depends partly on our recognition, since the said convention which co-determines the solution of the problem can be arbitrarily changed by us so that as a result we obtain different judgements.
In the present paper it is my intention to make that thesis of ordinary conventionalism more general and more radical. Namely, we want to formulate and to prove the theorem that not only some, but all the judgements which we accept and which combine to make up our image of the world are not univocally determined by empirical data, but depend on the choice of the conceptual apparatus by means of which we make mappings of those empirical data. We can, however, choose this or that conceptual apparatus, which will change our whole image of the world.”

— Kazimierz Ajdukiewicz

Kazimierz Ajdukiewicz, "Das Weltbild und die Begriffsapparatur", in Erkenntnis, 1934, Vol. 4, p. 259; as cited in: Schaff (1962;81-82)

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Kazimierz Ajdukiewicz 7

Philosopher, logician 1890–1963

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