Columbia subject headings:
Harvard subject headings:
Boole, George, 1815-1864.
Frege, Gottlob, 1848-1925.
Logic, Symbolic and mathematical.
Psychologism.
Princeton subject headings:
Boole, George, 1815-1864.
Frege, Gottlob, 1848-1925.
Logic, Symbolic and mathematical.
Psychologism.