# Re: All randomness is quantum...

```On 12/28/2013 4:11 PM, Edgar L. Owen wrote:
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`Jason and John,`
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If something is random it can't be computed by any deterministic process. That's the meaning.
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That's one possible meaning, although it can only strictly apply to infinite sets of something. I think of "random" as just being an instance from a probabilistic set. Here's what I wrote in another context recently:
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Probability has several different meanings and philosophers argue over them as if one must settle on the real meaning. But this is a mistake. Just like “cost” or “energy”, “probability” is useful precisely because the same value has different interpretations. There are four interpretations that commonly come up.
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1.It has a mathematical definition that lets us manipulate it and draw inferences (Kolmogorov).
```2.It has a physical interpretation as a symmetry (principle of insufficient
reason).
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3.It quantifies a degree of belief that tells us whether to act on it (Bayesian decision theory).
```4.It has an empirical meaning that lets us measure it (frequentist statistics).

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The usefulness of probability is that we can start with one of these, we can then manipulate it mathematically, and then interpret the result in one of the other ways.
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Brent
"Probability is never having to say you're certain."

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However we have to be careful because there is another kind of non-computability due to either not enough input data or computing power. The weather would be a combination of randomness and this type of non-coputability.
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Edgar
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