### „Bycie prawdziwym jest czymś innym niż bycie uważanym za prawdziwe.“

— Gottlob Frege

Źródło: Grundgesetze der Arithmetik, t. I, J. Woleński, Epistemologia, PWN, Warszawa 2005, s. 104.

2 0## Gottlob Frege

**Data urodzenia:** 8. Listopad 1848**Data zgonu:** 26. Lipiec 1925**Natępne imiona:**Friedrich Ludwig Gottlob Frege

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Friedrich Ludwig Gottlob Frege – niemiecki matematyk, logik i filozof, profesor matematyki w Jenie.

— Gottlob Frege

Źródło: Grundgesetze der Arithmetik, t. I, J. Woleński, Epistemologia, PWN, Warszawa 2005, s. 104.

— Gottlob Frege

Źródło: Sens i znaczenie, 1892

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— Gottlob Frege

Note in the appendix of Grundlagen der Arithmetik (Vol. 2) after Frege had received a letter of Bertrand Russell in which Russell had explained his discovery of, what is now known as, Russell's paradox.

— Gottlob Frege

Gottlob Frege, Montgomery Furth (1964). The Basic Laws of Arithmetic: Exposition of the System. p. 10

— Gottlob Frege

Vol. 2, p. 127. Replying to Bertrand Russell's letter about Russell's Paradox; quoted in The Stanford Encyclopedia of Philosophy http://plato.stanford.edu/entries/russell-paradox/

— Gottlob Frege

Vol. 1. pp. 137-140, as cited in: Ralph H. Johnson (2012), Manifest Rationality: A Pragmatic Theory of Argument, p. 87

— Gottlob Frege

Gottlob Frege (1956). "The thought: A logical inquiry" in: Peter Ludlow (1997) Readings in the Philosophy of Language. p. 27

— Gottlob Frege

As cited in: M. Fitting, Richard L. Mendelsoh (1999), First-Order Modal Logic, p. 142. They called this Frege's Puzzle.

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— Gottlob Frege

Gottlob Frege (1892). On Sense and Reference, note 7.

— Gottlob Frege

paraphrasing Frege's Begriffsschrift, a formula language, modeled upon that of arithmetic, for pure thought (1879) in Jean Van Heijenoort ed., in From Frege to Gödel: A Source Book in Mathematical Logic, 1879-1931 (1967)

— Gottlob Frege

Translation J. L. Austin (Oxford, 1950) as quoted by Stephen Toulmin, Human Understanding: The Collective Use and Evolution of Concepts (1972) Vol. 1, p. 56.

— Gottlob Frege

Translation J. L. Austin (Oxford, 1950) as quoted by , Human Understanding: The Collective Use and Evolution of Concepts (1972) Vol. 1, p. 55.

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— Gottlob Frege

Gottlob Frege (1950 [1884]). The Foundations of Arithmetic. p. 99.

— Gottlob Frege

"Letter to Bertrand Russel" (1902) in J. van Heijenoort, ed., From Frege to Godel: A Source Book in Mathematical Logic, 1879-1931 (1967)

— Gottlob Frege

Attributed to Frege in: A. A. B. Aspeitia (2000), Mathematics as grammar: 'Grammar' in Wittgenstein's philosophy of mathematics during the Middle Period, Indiana University, p. 25