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Nature allows only experimental situations to occur which can be described within the framework of the formalism of quantum mechanics

Werner Heisenberg

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Werner Heisenberg
Age: 74 †
Born: 1901
Born: December 5
Died: 1976
Died: February 1
Academic
Mathematician
Mountaineer
Non-Fiction Writer
Nuclear Physicist
Physicist
Theoretical Physicist
University Teacher
Kreisfreie Stadt Würzburg
Werner Karl Heisenberg
Heisenberg
Werner K. Heisenberg
Quantum
Occur
Situations
Formalism
Allows
Mechanics
Situation
Experimental
Within
Mechanic
Science
Framework
Nature
Described

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Thus, the more precisely the position is determined, the less precisely the momentum is known, and conversely.
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Whether we electrons, light quanta, benzol molecules, or stones, we shall always come up against these two characteristics, the corpuscular and the undular.
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Every tool carries with it the spirit by which it has been created.
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Where no guiding ideals are left to point the way, the scale of values disappears and with it the meaning of our deeds and sufferings, and at the end can lie only negation and despair. Religion is therefore the foundation of ethics, and ethics the presupposition of life.
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The problems of language here are really serious. We wish to speak in some way about the structure of the atoms. But we cannot speak about atoms in ordinary language.
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The solution of the difficulty is that the two mental pictures which experiment lead us to form - the one of the particles, the other of the waves - are both incomplete and have only the validity of analogies which are accurate only in limiting cases.
Werner Heisenberg
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The reality we can put into words is never reality itself.
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What we observe is not nature itself, but nature exposed to our method of questioning.
Werner Heisenberg
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The existing scientific concepts cover always only a very limited part of reality, and the other part that has not yet been understood is infinite.
Werner Heisenberg
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Science clears the fields on which technology can build.
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Many people will tell you that an expert is someone who knows a great deal about the subject. To this I would object that one can never know much about any subject. I would much prefer the following definition: an expert is someone who knows some of the worst mistakes that can be made in the subject, and how to avoid them.
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...separation of the observer from the phenomenon to be observed is no longer possible.
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The world thus appears as a complicated tissue of events, in which connections of different kinds alternate or overlap or combine and thereby determine the texture of the whole.
Werner Heisenberg
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What we observe is not nature itself but nature exposed to our method of questioning. Our scientific work in physics consists in asking questions about nature in the language that we possess and trying to get an answer from experiment by the means that are at our disposal.
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In the strict formulation of the law of causality—if we know the present, we can calculate the future—it is not the conclusion that is wrong but the premise. On an implication of the uncertainty principle.
Werner Heisenberg
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It was about three o'clock at night when the final result of the calculation [which gave birth to quantum mechanics] lay before me ... At first I was deeply shaken ... I was so excited that I could not think of sleep. So I left the house ... and awaited the sunrise on top of a rock.
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The Same organizing forces that have shaped nature in all her forms are also responsible for the structure of our minds.
Werner Heisenberg
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I believe that the existence of the classical path can be pregnantly formulated as follows: The path comes into existence only when we observe it.
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It is probably true quite generally that in the history of human thinking the most fruitful developments frequently take place at those points where two different lines of thought meet.
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My mind was formed by studying philosophy, Plato and that sort of thing.
Werner Heisenberg