 Nevertheless, he always insisted on the originality of his own phenomenological method. Between the two wars, Bolzano’s logic and philosophy of mathematics inspired Heinrich Scholz and Jean Cavaillès. Also during this period, Tarski discovered the concept of logical consequence independently of Bolzano, only becoming aware of the affinity between his work and Bolzano’s after Scholz (1937 [1961]) pointed it out. However, already in Twardowski (1894), the founder of the Polish Lvov-Warsaw school, Bolzano’s ideas were discussed and criticized at length, and some of them might have become common lore in the Polish school. In 1920, Hans Hahn edited the Paradoxes of the infinite with important critical notes, comparing Bolzano with Cantor. Karl Menger might have taken inspiration for his theory of dimension not only from Poincaré, but also from the Paradoxes. Neurath praised Bolzano as one of the ancestors of the Vienna Circle, because of the conciseness of his style and the rejection of Kant’s philosophy. Some important Bolzanian ideas are also found in the work of Quine. All these currents are indebted to Bolzano for the lesson of intellectual rigour and of analytic power. It is Bolzano who is the true founder of the kind of analytical philosophy whose core is logic and which is impregnated with science. His logic has archaic aspects, but he introduced not only new concepts, methods and theories, new themes and new problems, but above all a new spirit that has animated philosophy ever since.