A Quote by John Stewart Bell
Theoretical physicists live in a classical world, looking out into a quantum-mechanical world. The latter we describe only subjectively, in terms of procedures and results in our classical domain.
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In subjects that physicists think of as purely quantum, classical ideas and classical computational techniques can often be powerful.
Scientific realism in classical (i.e. pre-quantum) physics has remained compatible with the naive realism of everyday thinking on the whole; whereas it has proven impossible to find any consistent way to visualize the world underlying quantum theory in terms of our pictures in the everyday world. The general conclusion is that in quantum theory naive realism, although necessary at the level of observations, fails at the microscopic level.
Classical physics has been superseded by quantum theory: quantum theory is verified by experiments. Experiments must be described in terms of classical physics.
The only difference between causation and the value is that the word "cause" implies absolute certainty whereas the implied meaning of "value" is one of preference. In classical science it was supposed that the world always works in terms of absolute certainty and that "cause" is the more appropriate word to describe it. But in modern quantum physics all that is changed. Particles "prefer" to do what they do. An individual particle is not absolutely committed to one predictable behavior. What appears to be an absolute cause is just a very consistent pattern of preferences.
We live in a world that is subjectively open. And we are designed by evolution to be "informavores", epistemically hungry seekers of information, in an endless quest to improve our purchase on the world, the better to make decisions about our subjectively open future.
Personally, I think young musicians need to learn to play more than one style. Jazz can only enhance the classical side, and classical can only enhance the jazz. I started out playing classical, because you have to have that as a foundation.
When I do operas, I'm not really singing very classically. I have a classical background as far as being a pianist and an oboist, but my voice isn't really classical in the operatic sense. But I certainly have a classical sensibility, so I'm comfortable being in that world.
The development of quantum mechanics early in the twentieth century obliged physicists to change radically the concepts they used to describe the world.
Our users are trapeze artists, high school football coaches - I got cornered by a couple of theoretical physicists who said Dropbox lets them collaborate across the world and share their experiments' results. They were raving about how it's driving their research.
It seems sensible to discard all hope of observing hitherto unobservable quantities, such as the position and period of the electron... Instead it seems more reasonable to try to establish a theoretical quantum mechanics, analogous to classical mechanics, but in which only relations between observable quantities occur.
Certainly we do not need quantum mechanics for macroscopic objects, which are well described by classical physics - this is the reason why quantum mechanics seems so foreign to our everyday existence.
Nature isn't classical, dammit, and if you want to make a simulation of nature, you'd better make it quantum mechanical, and by golly it's a wonderful problem, because it doesn't look so easy.
Because of recent improvements in the accuracy of theoretical predictions based on large scale ab initio quantum mechanical calculations, meaningful comparisons between theoretical and experimental findings have become possible.
When I'm in the classical world, I really treat it as exactly classical and I don't try and spruce it up or jazz it up or make it easier for the masses.
No one intuitively understands quantum mechanics because all of our experience involves a world of classical phenomena where, for example, a baseball thrown from pitcher to catcher seems to take just one path, the one described by Newton's laws of motion. Yet at a microscopic level, the universe behaves quite differently.
For the moment, I am more focused on classical chess rather than rapid and blitz, as I am hoping to make my move in the classical World championship cycle.
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