[FOM] Standardization of sets, sorts, and free logic

Freek Wiedijk freek at cs.ru.nl
Wed Oct 21 04:37:00 EDT 2015

Dear Anthony,

>But the Standard Library needs a Standard
>Logic, so "(1+1)/0 = 2/0" and "1/0 + 2 = 2 + 1/0" must
>each either be provable or not provable.

Isn't there a third possibility: both these statements
are ill-formed?  Or does that fall in your "not provable"
category?  But in that case the negation is not provable


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