This volume portrays the Polish or Lvov-Warsaw School, one of the most influential schools in analytic philosophy, which, as discussed in the thorough introduction, presented an alternative working picture of the unity of science.

Inthisarticle,IreconstructKazimierzAjdukiewicz’sviewthathecalledradical conventiona‐ l i s m (as opposed to moderate conventionalism developed by Henri Poincaré and Pierre Duhem). then, I recall little‐known criticism of this approach developed by Stefan Amsterdamski. Finally, I demonstrate, contrary to the conception of the originator’s declarations, that a radical conventio‐ nalism is not a ‘paper ction’. On the other hand, the standpoint of radical conventionalism is useful due to the precision of expressions provided to it by Ajdukiewicz; it shows the di culties that have to (...) be tackled by each philosophical approach assuming a social constructivism or related notion. (shrink)