“Use "entropy" and you can never lose a debate, von Neumann told Shannon - because no one really knows what "entropy" is.”

— William Poundstone

Part One, Entropy, Randomness, Disorder, Uncertainty, p. 57
Fortune's Formula (2005)

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William Poundstone 33

American writer 1955

Related quotes

“My greatest concern was what to call it. I thought of calling it 'information,' but the word was overly used, so I decided to call it 'uncertainty.' When I discussed it with John von Neumann, he had a better idea. Von Neumann told me, 'You should call it entropy, for two reasons. In the first place your uncertainty function has been used in statistical mechanics under that name, so it already has a name. In the second place, and more important, no one really knows what entropy really is, so in a debate you will always have the advantage.”

Claude Elwood Shannon (1916–2001) American mathematician and information theorist

Scientific American (1971), volume 225, page 180.
Explaining why he named his uncertainty function "entropy".

“In the second place, and more important, no one really knows what entropy really is, so in a debate you will always have the advantage.”

John Von Neumann (1903–1957) Hungarian-American mathematician and polymath

Suggesting to Claude Shannon a name for his new uncertainty function, as quoted in Scientific American Vol. 225 No. 3, (1971), p. 180.
Context: You should call it entropy, for two reasons. In the first place your uncertainty function has been used in statistical mechanics under that name, so it already has a name. In the second place, and more important, no one really knows what entropy really is, so in a debate you will always have the advantage.

“A mind of von Neumann's inexorable logic had to understand and accept much that most of us do not want to accept and do not even wish to understand.”

Eugene Paul Wigner (1902–1995) mathematician and Nobel Prize-winning physicist

Biographical memoir: "John von Neumann (1903 - 1957)" in Year book of the American Philosophical Society (1958); later in Symmetries and Reflections : Scientific Essays of Eugene P. Wigner (1967), p. 261
Context: A deep sense of humor and an unusual ability for telling stories and jokes endeared Johnny even to casual acquaintances. He could be blunt when necessary, but was never pompous. A mind of von Neumann's inexorable logic had to understand and accept much that most of us do not want to accept and do not even wish to understand. This fact colored many of von Neumann's moral judgments. "It is just as foolish to complain that people are selfish and treacherous as it is to complain that the magnetic field does not increase unless the electric field has a curl. Both are laws of nature." Only scientific intellectual dishonesty and misappropriation of scientific results could rouse his indignation and ire — but these did — and did almost equally whether he himself, or someone else, was wronged.

“Von Neumann languages do not have useful properties for reasoning about programs. Axiomatic and denotational semantics are precise tools for describing and understanding conventional programs, but they only talk about them and cannot alter their ungainly properties. Unlike von Neumann languages, the language of ordinary algebra is suitable both for stating its laws and for transforming an equation into its solution, all within the "language."”

John Backus (1924–2007) American computer scientist

"Can Programming Be Liberated From the von Neumann Style?" http://dl.acm.org/ft_gateway.cfm?id=1283933&type=pdf, 1977 Turing Award Lecture, Communications of the ACM 21 (8), (August 1978): pp. 639-640