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|Logic||A. d'Abro Die Kontroversen über das Wesen der Mathematik 1939 in Kursbuch 8 Mathematik 1967
Logic/Hilbert/d'Abro: Arithmetic is, in fact, to be regarded as a part of logic; however, when looking carefully, we see that certain fundamental concepts of arithmetic have already been employed in the formulation of the laws of logic, e.g. the concept of quantity and, in part, of the number.
So we get into a circle. To avoid this, a simultaneous development of logic and arithmetic is required.