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How do two negatives equal a positive?

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Ripley Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 09:17 PM
Original message
How do two negatives equal a positive?
Edited on Wed Apr-07-04 10:05 PM by Ripley
No text needed.......hah.
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kiahzero Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 09:21 PM
Response to Original message
1. These are added
Added negatives never equal a positive.

If they were multiplied, then they'd equal a positive.
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apnu Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 09:33 PM
Response to Original message
2. and then there is logic
When doing proofs certain things make a negative and sometimes a negative becomes a double negative that becomes a positive.

Like this Modus Tollens rule that says
if you have P then Q
Then you have ~Q (not Q)
You can deduce ~P

and by that logic...

If ~P then Q
~Q
Therefore ~~P
(and there's another replacement rule that turns ~~P into P called Double Negation)
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DieboldMustDie Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 09:40 PM
Response to Reply #2
3. "...if it was so, it might be;
and if it were so, it would be; but as it isn't, it ain't. That's logic." ;)

-- Tweedledee
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apnu Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 09:50 PM
Response to Reply #3
6. yup that's logic for you.
Although logicians make it out to be much more grand sounding, but that's all it is. Oh! that and it's a tool for other sciences and lawyers to abuse.
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Ripley Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 10:16 PM
Response to Reply #6
11. I don't get it.
Yet.
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tg Donating Member (80 posts) Send PM | Profile | Ignore Wed Apr-07-04 09:57 PM
Response to Reply #3
7. The method employed I would gladly explain
While I have it still fresh in my head
If I had but the time and you had but the brain
But so much yet remains to be said.

-- Hunting of the Snark
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Ripley Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 10:01 PM
Response to Reply #2
8. aaackk.
Mr. Ripley ...bad news.
Ripley's Mom...bad news.

Sorry I'm not a good scientist,,,
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apnu Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 10:14 PM
Response to Reply #8
10. you're missing one component
"Logically" speaking. You seem to have two premises but no conclusion. In logic, all statements are translated into a variable letter, that's positive. So "Mr. Ripley... bad news." could be shown as "M" and "Ripley's Mom... bad news." could be "R"

So if you negate "M" as "~M" you'd have Mr. Ripley... (does not have) bad news."

But that's just messing around with premises, you don't have a conclusion, like "Therefore, there is bad news." or "I conclude that there is not bad news."

All logic statements must have at least one premise and one conclusion.
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Ripley Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 10:22 PM
Response to Reply #10
12. God is.
God is not.
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apnu Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 10:44 PM
Response to Reply #12
15. You can say that as a premise
But "God is not." isn't a conclusion. You're just using the Double Negation translation to turn a positive into a negative. Which is a "legal" move in proof concepts to prove a conclusion, but as you have it, "God is not" isn't the conclusion. You need something in there to help you conclude that "God is not."

A valid argument (which isn't necessarily true or false) could be:

People tell me that God is. (your "god is." statement)
But I haven't found God.
-------
Therefore God is not.

However, not to confuse you, but that's called a False Dichotomy. Saying that there is no evidence for something and then basing a positive or negative conclusion based on lack of evidence is considered a fallacy.

It's really hard to argue God in logic, for or against, without falling into the trap of a fallacy. Most logicians will avoid it if they can.
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Az Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 09:40 PM
Response to Original message
4. So this english teacher is teaching his class about double negatives
He tells them that while a double negative results in a positive statement a double positive does not result in a negative statement.

From the back of the class a student mutters "Yeah, right."
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BigMcLargehuge Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 09:41 PM
Response to Reply #4
5. HAHAHAHAHAHAHHA!!!!
:)
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mike1963 Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 10:12 PM
Response to Reply #4
9. Okay, turd, you owe me a keyboard!
:D
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Selwynn Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 10:28 PM
Response to Reply #4
13. That's funny!
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TahitiNut Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 10:37 PM
Response to Original message
14. How don't two negatives not equal a positive?
:shrug:
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apnu Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Apr-07-04 10:49 PM
Response to Reply #14
16. heh
LOL you're statement is amusing... I had to think about it for a while. Nice mind bender there.
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