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Originally posted by Dragiero
reply to post by captaintyinknots
I told you that these were reports, so what were you expecting?
Originally posted by stereologist
reply to post by captaintyinknots
Clearly you are playing asinine games with words. I proved a negative, not a universal negative, but a negative.
No, I'm not, nor am I trying to argue it. It is a concept that is very in depth. Proving something is not in your backyard right now is not proving a negative, it is proving the positive that your backyard does not contain that thing. Proving a negative would be proving that it was NEVER there.
Originally posted by stereologist
reply to post by captaintyinknots
No, I'm not, nor am I trying to argue it. It is a concept that is very in depth. Proving something is not in your backyard right now is not proving a negative, it is proving the positive that your backyard does not contain that thing. Proving a negative would be proving that it was NEVER there.
I have a proposition A. I can formulate the negative proposition ~A. Are you claiming that both propositions are positives? LOL. Very funny.
Originally posted by stereologist
reply to post by captaintyinknots
Ooooh. Out with the ad hominems.
So x>0 has a negative x
The two numeric statements you made are not negatives. They are seperate statements. You are thinking of opposites, not negatives. There is a difference, kiddo.
As stated, the rule "You can't prove a negative" is demonstrably false.
It is widely believed that you can’t prove a negative. Some people even think that it is a law of logic—you can’t prove that Santa Claus, unicorns, the Loch Ness Monster, God, pink elephants, WMD in Iraq and Bigfoot don’t exist. This widespread belief is flatly, 100% wrong.
There is one big problem with this. Among professional logicians, guess how many think that you can’t prove a negative? That’s right, zero. Yes, Virginia, you can prove a negative, and it’s
easy, too. For one thing, a real, actual law of logic is a negative, namely the law of noncontradiction.
This law states that that a proposition cannot be both true and not true. Nothing is
both true and false. Furthermore, you can prove this law. It can be formally derived from the
empty set using provably valid rules of inference. (I’ll spare you the boring details). One of the laws
of logic is a provable negative. Wait … this means we’ve just proven that it is not the case that
one of the laws of logic is that you can’t prove a negative. So we’ve proven yet another
negative! In fact, “you can’t prove a negative” is a negative — so if you could prove it true, it
wouldn’t be true! Uh-oh.
Originally posted by Mikemp44
If there are stories about it than those stories were based on something real. The true question is how close does the real thing resemble what the stories portray? It is said that recent archeological evidence shows that 7,000 years ago some dinosaurs did still exist, as tribes would carve dolls and fashion clay models that were of dinosaurs. HOW COULD THEY KNOW WHAT A DINO WAS IF THEY DIDN'T EXIST???
“His strong scales are his pride, shut up as with a tight seal. . . . His sneezes [breathings] flash forth light, and his eyes are like the eyelids of the morning. Out of his mouth go burning torches; sparks of fire leap forth. Out of his nostrils smoke goes forth, as from a boiling pot and burning rushes. His breath kindles coals, and a flame goes forth from his mouth.”
Originally posted by stereologist
School time seems a must.
Let's learn what negation is.
Negation
Now it's a statement of proving a negative.
"You Can't Prove a Negative"
As stated, the rule "You can't prove a negative" is demonstrably false.
You can prove a negative
It is widely believed that you can’t prove a negative. Some people even think that it is a law of logic—you can’t prove that Santa Claus, unicorns, the Loch Ness Monster, God, pink elephants, WMD in Iraq and Bigfoot don’t exist. This widespread belief is flatly, 100% wrong.
You can prove a negative
There is one big problem with this. Among professional logicians, guess how many think that you can’t prove a negative? That’s right, zero. Yes, Virginia, you can prove a negative, and it’s
easy, too. For one thing, a real, actual law of logic is a negative, namely the law of noncontradiction.
This law states that that a proposition cannot be both true and not true. Nothing is
both true and false. Furthermore, you can prove this law. It can be formally derived from the
empty set using provably valid rules of inference. (I’ll spare you the boring details). One of the laws
of logic is a provable negative. Wait … this means we’ve just proven that it is not the case that
one of the laws of logic is that you can’t prove a negative. So we’ve proven yet another
negative! In fact, “you can’t prove a negative” is a negative — so if you could prove it true, it
wouldn’t be true! Uh-oh.
Finally, here is a place where negation is used in proofs.
Modus Tollens
Originally posted by DrJay1975
I think the myths about dragons come simply from dinosaurs. It's not hard to think that people thousands of years ago may have thought a pterodactyl skeleton belonged to a dragon. And who knows maybe some of these creatures survived the mass extinction and they were around in limited quantities thousands of years ago. That isn't a stretch.
But a firebreathing dragon? Come on. I can buy into a giant lizard or even a dinosaur surviving their armageddon, but dragons in the traditional sense today don't seem plausible.