What is Probability

@inproceedings{Saunders1969WhatIP,
  title={What is Probability},
  author={Simon Saunders},
  year={1969}
}
Probabilities may be subjective or objective; we are concerned with both kinds of probability, and the relationship between them. The fundamental theory of objective probability is quantum mechanics: it is argued that neither Bohr's Copenhagen interpretation, nor the pilot-wave theory, nor stochastic state-reduction theories, give a satisfactory answer to the question of what objective probabilities are in quantum mechanics, or why they should satisfy the Born rule; nor do they give any reason… 
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TLDR
It is proved that the unpredictability of measurement outcomes necessarily arises in superinformation theories, and sufficient conditions are established for a superinformation theory to inform decisions as if it were probabilistic, via a Deutsch–Wallace-type argument.
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TLDR
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The Quantum Mechanical Frame of Reference
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