Columbia subject headings:
Harvard subject headings:
Frege, Gottlob, 1848-1925--Criticism and interpretation.
Husserl, Edmund, 1859-1938--Criticism and interpretation.
Logic, Symbolic and mathematical.
Mathematics--Philosophy
Wittgenstein, Ludwig, 1889-1951--Criticism and interpretation.
Princeton subject headings:
Frege, Gottlob, 1848-1925--Criticism and interpretation.
Husserl, Edmund, 1859-1938--Criticism and interpretation.
Logic, Symbolic and mathematical.
Mathematics--Philosophy.
Wittgenstein, Ludwig, 1889-1951--Criticism and interpretation.