[FOM] When is it appropriate to treat isomorphism as identity?

Alex Blum blumal at mail.biu.ac.il
Fri Apr 24 06:31:57 EDT 2009

Vaughan Pratt wrote:

>A benefit of mathematical logic is that it makes explicit principles of 
>logic that we might otherwise consider inviolable, allowing us to 
>consider the consequences of violating them by replacing them with 
>competing rules, thereby contributing to the ongoing undermining of the 
>efficacy of pure reason.
Is it realistic to think of fol or of sol or their principles as being 
violable if our paramont interest in logic is that inference preserve truth.
Alex Blum

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