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Journal Article I.—THE THOUGHT: A LOGICAL INQUIRY Get access GOTTLOB FREGE GOTTLOB FREGE Search for other works by this author on: Oxford Academic Google Scholar Mind, Volume 65, Issue 1, 1956, Pages 289–311, https://doi.org/10.1093/mind/65.1.289 Published: 01 January 1956
Gottlob Frege (Sun,) studied this question.