Columbia subject headings:
Frege, Gottlob, 1848-1925.
Language and logic.
Logic.
Mathematics--Philosophy.
Russell, Bertrand, 1872-1970.
Semantics (Philosophy)
Harvard subject headings:
Frege, Gottlob, 1848-1925--Contributions in logic.
Language and logic.
Mathematics--Philosophy
Russell, Bertrand, 1872-1970--Contributions in logic.
Semantics (Philosophy)
Princeton subject headings:
Frege, Gottlob, 1848-1925.
Language and logic.
Mathematics--Philosophy.
Russell, Bertrand, 1872-1970.
Semantics (Philosophy)