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Quantum mechanics brought an unexpected fuzziness into physics because of quantum uncertainty, the Heisenberg uncertainty principle.
Edward Witten
It's indeed surprising that replacing the elementary particle with a string leads to such a big change in things. I'm tempted to say that it has to do with the fuzziness it introduces.
Edward Witten
I found that many Americans did not even know that a country named Iran existed, let alone what it was like. Even among the diplomatic corps and among well-educated people, there was a vagueness about who the Iranians were or what the culture was, a tendency to confuse Iran with Iraq or to mistakenly assume that Iran is an Arab country simply because it is an Islamic nation. This fuzziness about the world outside is unique to America; among the intelligensia of European countries, for example, there is generally a higher level of awareness and information regarding cultures other than their own.
Ashraf Pahlavi
I would like to comment briefly on Professor Zadeh's presentation. His proposals could be severely, ferociously, even brutally criticized from a technical point of view. This would be out of place here. But a blunt question remains: Is professor Zadeh presenting important ideas or is he indulging in wishful thinking? No doubt Professor Zadeh's enthusiasm for fuzziness has been reinforced by the prevailing climate in the U. S.-one of unprecedented permissiveness. 'Fuzzification, is a kind of scientific permissiveness; it tends to result in socially appealing slogans unaccompanied by the discipline of hard scientific work and patient observation.
Rudolf E. Kálmán
Quantum mechanics brought an unexpected fuzziness into physics because of quantum uncertainty, the Heisenberg uncertainty principle. String theory does so again because a point particle is replaced by a string, which is more spread out.
Edward Witten
On the other hand, we don't understand the theory too completely, and because of this fuzziness of spacetime, the very concept of spacetime and spacetime dimensions isn't precisely defined.
Edward Witten