Date: Mar 15, 2013 4:21 AM
Author: Graham Cooper
Subject: Re: Number of variables needed to axiomatize first order predicate calculus?
On Mar 13, 5:56 pm, George Greene <gree...@email.unc.edu> wrote:

> On Mar 9, 7:20 am, Rupert <rupertmccal...@yahoo.com> wrote:

>

> > I can't see how an axiomatisation of first-order predicate calculus

> > using a finite number of individual variables would ever do justice

> > to all of the first-order predicate calculus.

> > There's no finite upper bound on the number of individual variables that can occur in a formula.

>

> That's not really a reasonable objection.

> There is no finite upper bound on the number of propositional letters

> that can occur in a proposition EITHER,

> yet they handled it. Obviously you would handle THAT in basically the

> same way, with a class of variables

> ranging over all formulas.

Use words, not letters!

Herc

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