A Quote by Gian-Carlo Rota
Running overtime is the one unforgivable error a lecturer can make. After fifty minutes (one microcentury as von Neumann used to say) everybody's attention will turn elsewhere.
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There was a seminar for advanced students in Zürich that I was teaching and von Neumann was in the class. I came to a certain theorem, and I said it is not proved and it may be difficult. Von Neumann didn't say anything but after five minutes he raised his hand. When I called on him he went to the blackboard and proceeded to write down the proof. After that I was afraid of von Neumann.
John von Neumann gave me an interesting idea: that you don't have to be responsible for the world that you're in. So I have developed a very powerful sense of social irresponsibility as a result of von Neumann's advice. It's made me a very happy man ever since. But it was von Neumann who put the seed in that grew into my active irresponsibility!
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.'
I remember my friend Johnny von Neumann used to say, 'with four parameters I can fit an elephant and with five I can make him wiggle his trunk.'
If you didn't know what you were trying to do, [Robert von Neumann] wouldn't say a word. He would just turn and walk away. So you very quickly learned to think that you'd better be attempting to do something in that painting class.
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 von Neumann draws attention to what seemed to him a contrast. He remarked that for simple mechanisms, it is often easier to describe how they work than what they do, while for more complicated mechanisms, it is usually the other way around.
John von Neumann was the only student I was ever afraid of.
In desperation I asked Fermi whether he was not impressed by the agreement between our calculated numbers and his measured numbers. He replied, "How many arbitrary parameters did you use for your calculations?" I thought for a moment about our cut-off procedures and said, "Four." He said, "I remember my friend Johnny von Neumann used to say, with four parameters I can fit an elephant, and with five I can make him wiggle his trunk." With that, the conversation was over.
After preliminary work by a number of other distinguished mathematicians and economists, game theory as a systematic theory started with von Neumann and Morgenstern's book, 'Theory of Games and Economic Behavior,' published in 1944.
There are two kinds of people in the world: Johnny Von Neumann and the rest of us.
When people say, "I've told you fifty times," They mean to scold, and very often do; When poets say, "I've written fifty rhymes," They make you dread that they'll recite them too; In gangs of fifty, thieves commit their crimes; At fifty love for love is rare, 't is true, but then, no doubt, it equally as true is, a good deal may be bought for fifty Louis.
Pascal and C are special-purpose languages for manipulating the registers and memory of a von Neumann-style computer.
... The approach of von Neumann and Connes to the use of non-commutative algebra in physics is naive, the situation is much more complicated.
Be more attentive to what successful people have to say about all the opportunity around you. Anything important - which takes only two minutes to point out - will exceed most people's attention span by at least a minute and a half. Learn to pay attention for two minutes at a time - and you will see more opportunity than you know what to do with.
No consensus of men can make an error erroneous. We can only find or commit an error, not create it. When we commit an error, we say what was an error already.
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