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I have just read Confessions of a Confirmed Extensionalist where Quine says:

“Probability? Of events? Restore extensionality (...). Of states of affairs? Treat quotationally, like de dicto. How much remains e.g. in quantum mechanics?”

1)I am wondering why Quine’s approach of treating probability as de dicto modality does not work in QM?

2)Quine somewhere else talks about subjective probability and he seems to adhere to it (please correct me if I am wrong) since it admits a de dicto formulation. Why Quine’s version of subjective probability is not fine to make sense probability in QM?

Thanks.

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