Lotfi A. Zadeh quote: “[ Fuzzy logic is ] a logic whose distinguishing features are (i) fuzzy truth-values expressed in linguistic terms, e. g…”

“The term fuzzy logic is used in this paper to describe an imprecise logical system, FL, in which the truth-values are fuzzy subsets of the unit interval with linguistic labels such as true, false, not true, very true, quite true, not very true and not very fake, etc…. As a consequence, the truth tables and the rules of inference in fuzzy logic are (i) inexact and (ii) dependent on the meaning associated with the primary truth-value true as well as the modifiers very quite.”

George Klir (1932–2016) American computer scientist

Lotfi Asker Zadeh, George Klir, Bo Yuan (1996) Fuzzy Sets, Fuzzy Logic, and Fuzzy Systems: Selected Papers. p. 238.

“The term fuzzy logic is used in this paper to describe an imprecise logical system, FL, in which the truth-values are fuzzy subsets of the unit interval with linguistic labels such as true, false, not true, very true, quite true, not very true and not very fake, etc…. As a consequence, the truth tables and the rules of inference in fuzzy logic are (i) inexact and (ii) dependent on the meaning associated with the primary truth-value true as well as the modifiers very quite.”

Lotfi A. Zadeh (1921–2017) Electrical engineer and computer scientist

Lotfi Asker Zadeh, George Jiri Klir, Bo Yuan (1996) Fuzzy Sets, Fuzzy Logic, and Fuzzy Systems: Selected Papers. p. 238
1990s

“A frequent source of misunderstanding has to do with the interpretation of fuzzy logic. The problem is that the term fuzzy logic has two different meanings. More specifically, in a narrow sense, fuzzy logic, FLn, is a logical system which may be viewed as an extension and generalization of classical multivalued logics. But in a wider sense, fuzzy logic, FLw is almost synonymous with the theory of fuzzy sets. In this context, what is important to recognize is that: (a) FLw is much broader than FLn and subsumes FLn as one of its branches; (b) the agenda of FLn is very different from the agendas of classical multivalued logics; and (c) at this juncture, the term fuzzy logic is usually used in its wide rather than narrow sense, effectively equating fuzzy logic with FLw</sub”

Lotfi A. Zadeh (1921–2017) Electrical engineer and computer scientist

Zadeh (1995) in Foreword of George J. Klir Fuzzy sets and fuzzy logic: theory and applications.
1990s

“We can never add more truth to what is true already, nor make that true which is false.”

Bernard Le Bovier de Fontenelle (1657–1757) French writer, satirist and philosopher of enlightenment

p, 125
The History of Oracles, and the Cheats of the Pagan Priests (1688)

“A perfectly true thought, expressed in very sound terms, can satisfy the reason without giving any impression of the Beautiful; but in that case certainly there is something false in its statement. It is essential that Truth be in Glory. Splendor of style is not a luxury. It is a necessity.”

Léon Bloy (1846–1917) French writer, poet and essayist

Source: Pilgrim of the Absolute (1947), p. 88

“The assimilation of tautologies and contradictions with true and false propositions respectively results from the fact that tautologies and contradictions can be taken as truth-functions just like ordinary propositions, and for determining the truth of falsity of the truth-function, tautologies and contradictions among its arguments must be counted as true or false respectively. …Are the propositions of symbolic logic and mathematics tautologies in Mr Wittgenstein's sense?”

Frank P. Ramsey (1903–1930) British mathematician, philosopher

The Foundations of Mathematics (1925)

“Eclecticism. Every truth is so true that any truth must be false.”

F. H. Bradley (1846–1924) British philosopher

No. 6.
Aphorisms (1930)

“There are no hard distinctions between what is real and what is unreal, nor between what is true and what is false. A thing is not necessarily either true or false; it can be both true and false.”

Harold Pinter (1930–2008) playwright from England

11
Writing for the Theatre (1962)

“205. If the true is what is grounded, then the ground is not true, nor yet false.”

Ludwig Wittgenstein book On Certainty

On Certainty (1969)

“The search for necessary truths, truths that are not only true, but they couldn’t have been false.”

Charles Hartshorne (1897–2000) Philosopher

In the Veery journal interview in 1996, in reply to the question of "What is the most rewarding aspect of philosophy?" presented by Veery editor Steven Vita, later reprinted in 1997 in the Austin American-Statesman and then quoted from in The New York Times obituary entitled “Charles Hartshorne, Theologian, Is Dead; Proponent of an Activist God Was 103.”

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