[FOM] Fact and opinion in F.O.M.

Timothy Y. Chow tchow at math.princeton.edu
Tue Dec 24 12:28:12 EST 2019


Joe Shipman wrote:

> Recently I concluded that the biggest problem in internet discussion of 
> public policy was that most people seemed not to competently distinguish 
> between fact and opinion, and that one easy distinguishing feature is 
> that people of good will cannot be in permanent disagreement about a 
> matter of fact, so that people who mistook their opinion for a fact 
> might unfairly regard their opponents as perverse or dishonest.
>
> I now see that this distinction sheds light on some puzzles regarding 
> choice of axioms.
>
> To a first approximation, statements of arithmetic are matters of fact, 
> while provably independent statements like CH are matters of opinion.

I don't fully understand what you're saying.  You seem to be conflating 
metaphysics and epistemology.

Is a provably independent statement of arithmetic a "fact" or an 
"opinion"?

If a "fact" is something that people of good will cannot be in permanent 
disagreement about, then it would seem that the analogue in mathematics 
would be a theorem, rather than a statement of arithmetic.

Tim


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