The law of identity is that anything referred to equals itself. It doesn't mean that the law of identity itself is equal to "P=P", and then you can plug it into symbolic logic using logical/mathematical notation to prove that not the case P = not the case P is equal to P=P. Thte law of identity is a pre-step to symbolic logic necessary to make logic itself work. It is outside of the equations. "P" is a placeholder for a "something", and a "something" does not equal all somlethings except in a semantic sense. A cat is a thing. A dog is a thing. A cat does not = a dog. Something = something, referring only to the word itself, not referring to what the word indirectly represents. Or think of Doberman and Collie. Both are Dogs (both are "things") but they are not equivalent to each other. They are not the same thing.Eodnhoj7 wrote: ↑Fri Jun 12, 2026 9:19 pmP=P is LI.Gary Childress wrote: ↑Fri Jun 12, 2026 3:56 pmSo what is your reply to the point that thomyum2 made? And what do you mean when you posit thatEodnhoj7 wrote: ↑Thu Jun 11, 2026 9:46 pm
It was an observation, not an argument can be said likewise.
Anyone can claim "right" or "wrong". No definition behind it just leaves a tautology.
The text has been test multiple times, against multiple AIs. The simple truth is that your response only proves human intellect becoming obsolete.I mean, I don't see how (P=P) = (not the case P=not the case P). It sounds like you're making a logical mistep somewhere, though my logic is rusty these days.Dually both (P=P) and (-P=-P) equate as both expressions of the law of identity; to say ((P=P)=(-P=-P)) is to say the law of identity is equivalent to itself.
-P=-P is LI
LI = LI as LI.
I wish I could remember symbolic logic well enough to give an answer in symbolic logic; however, your statement "(P=P)=(not the case P=not the case P) is clearly a flawed argument, as the example of Dog and Cat easily demonstrates.
Or is your point to say that the law of identity itself cannot be trusted? For example, "Napoleon, the leader of France" maybe is not the same as "Napoleon, the General", in a sense. They are not logically identical terms. But they can be made logically identical with the right notations. For example if we both agree that "Napoleon was both a leader of France and a General" then we could subsitute the two separate terms "Napoleon, the leader of France" and "Napoleon, the General" with "Napoleon who was both the leader of France and a General" We must both agree to the statement and then when we both agree we can plug it into a logical argument to see what we come up with. But it's important to get the terms identical in order for the law of identity to work in logic. And if two things are not the same thing, then they are not the same thing according to the fundamental premise that P=P. Meaning the same P = the same P.