Philosophical and mathematical correspondence [by] Gottlob Frege /
Frege, Gottlob,1848-1925.
Gabriel, Gottfried.
McGuinness, Brian.
Kaal, Hans.
Oxford Blackwell
1980
Translated and abridged from: 'Wissenschaftlicher Briefwechsel'. Hamburg: Felix Meiner, 1976
Includes index
Logic, Symbolic and mathematical.