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Topic: at the background of logic
Replies: 5   Last Post: Jun 13, 2013 7:52 AM

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Peter Percival

Posts: 2,623
Registered: 10/25/10
Re: at the background of logic
Posted: Jun 13, 2013 7:52 AM
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William Elliot wrote:
> On Wed, 12 Jun 2013, Zuhair wrote:

>> I think that all logical connectives, quantifiers and identity are
>> derivable from a simple semi-formal inference rule denoted by "|" to
>> represent "infers" and this is not to be confused with the Sheffer
>> stroke nor any known logical connective.
>> A| C can be taken to mean the "negation of A"
>> A,B| A can be taken to mean the "conjunction of A and B"

> Requires both that and A,B| B.

>> x| phi(x) can be taken to mean: for all x. phi(x)
> Confusion of propositions and objects.

How so?

I think I am an Elephant,
Behind another Elephant
Behind /another/ Elephant who isn't really there....
A.A. Milne

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