On Tuesday, October 8, 2019 at 6:21:29 PM UTC-5, Bruce wrote:

 classical probability due to lack of knowledge -- nothing quantum about it
>
 

> Bruce 
>


Even before QM came on the scene, there were competing and differing ideas 
of probability, including "knowledge-independent" (3.):

 
https://plato.stanford.edu/entries/probability-interpret/

Broadly speaking, there are arguably three main concepts of probability:

   1. An epistemological concept, which is meant to measure objective 
   evidential support relations. For example, “in light of the relevant 
   seismological and geological data, California will *probably* experience 
   a major earthquake this decade”.
   2. The concept of an agent’s degree of confidence, a graded belief. For 
   example, “I am not sure that it will rain in Canberra this week, but it 
   *probably* will.”
   3. A physical concept that applies to various systems in the world, 
   independently of what anyone thinks. For example, “a particular radium atom 
   will *probably* decay within 10,000 years”.

3. is present in Epicurus to C. S. Peirce.

@philipthrift

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