How to check if a string "is" an int?

Alex Martelli aleax at
Sat Dec 24 07:25:59 CET 2005

Paul Rubin <> wrote:

> "Fredrik Lundh" <fredrik at> writes:
> >     A: are there any blue cars on the street?
> >     B: no.  not a single one.
> >     A: you're wrong! all cars on the street are blue!
> B and A are both correct.  It's just logic ;-).

Charles Lutwidge Dodgson spent his professional life arguing against
this, as I mentioned in
<> --
but, mostly, "mainstream" logic proceeded along the opposite channel you
mention.  Good thing he had interesting hobbies (telling stories to
children, and taking photographs), or today he perhaps might be
remembered only for some contributions to voting-theory;-).

I don't know of any "complete and correct" logic (or set-theory) where
there is more than one empty-set, but I'm pretty sure that's because I
never really dwelled into the intricacies of modern theories such as
modal logic (I would expect modal logic, and intensional logic more
generally, would please Dodgson far better than extensional logic...
but, as I said, I don't really understand them in sufficient depth)... 


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