Proof A=A

[Purple Rabbit]

Succes!

[Ashes1995]

? im confused, please explain

[Purple Rabbit]

(16th February 2010 21:08)Ashes1995 Wrote:  ? im confused, please explain

Confused? How can that be? This is at the root of logic. Should be easy.

[Darwinian]

The law of identity, A = A

The law of contradiction, A cannot be both A and not A

The law of the excluded middle, A must be either A or not A

[Purple Rabbit]

(16th February 2010 21:13)Darwinian Wrote:  The law of identity, A = A

The law of contradiction, A cannot be both A and not A

The law of the excluded middle, A must be either A or not A

And your proof?

[Darwinian]

(16th February 2010 21:15)Purple Rabbit Wrote:  

(16th February 2010 21:13)Darwinian Wrote:  The law of identity, A = A

The law of contradiction, A cannot be both A and not A

The law of the excluded middle, A must be either A or not A

And your proof?

Proof? How can you ask that? This is at the root of logic. Should be easy.

[Purple Rabbit]

(16th February 2010 21:17)Darwinian Wrote:  

(16th February 2010 21:15)Purple Rabbit Wrote:  

(16th February 2010 21:13)Darwinian Wrote:  The law of identity, A = A

The law of contradiction, A cannot be both A and not A

The law of the excluded middle, A must be either A or not A

And your proof?

Proof? How can you ask that? This is at the root of logic. Should be easy.

Well, what is your proof for the very basis of logic? It's pretty basic you know. Without proof anything goes.

[Darwinian]

Because A cannot be what it is not, and you must choose what you want to live by.

Aristotle

[Purple Rabbit]

(16th February 2010 21:25)Darwinian Wrote:  Because A cannot be what it is not, and you must choose what you want to live by.

Aristotle

That's an argument (not proof) for: A ≠ ¬A

[Saerules]

The only proof for it is itself.