# Should I explain this with the theory of Yin & Yang?

• George L.
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May 30th, 2008, 5:03 am

Quote:
p -> q

~p -> ~q
q -> p

I've been thinking of this, I try to make it logical. Is it beyond logic in mathematics?

***Assume for the above equation***

q = you're my friend

If I'm your friend, then you're my friend

is NOT equivalent to

If I'm not your friend, then you're not my friend

which is equivalent to

If you're my friend, then I'm your friend

Question is What's the difference between:

If I'm your friend, then you're my friend
with
If you're my friend, then I'm your friend

I conclude that it's because Yin and Yang?
• Anonymous
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May 30th, 2008, 5:03 am

• Don2007
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May 30th, 2008, 5:41 am

I do a lot of internal martial arts. Yin is absorbing chi, yang is expelling chi. You comparison could be correct only if I have to expel chi to be your friend.
How do you know when a politician is lying? His mouth is moving.
• spork
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May 30th, 2008, 6:48 am

Boolean logic, hooray!
The Beer Monocle. Classy.
• George L.
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May 30th, 2008, 8:11 am

Don2007 wrote:
I do a lot of internal martial arts. Yin is absorbing chi, yang is expelling chi. You comparison could be correct only if I have to expel chi to be your friend.

lol

Let me analyze what you just said.
• Snow is on Fire
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May 30th, 2008, 8:49 am

Ha ha. Logical people make me laugh.
• spork
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May 30th, 2008, 9:07 am

George L. wrote:
Question is What's the difference between:

If I'm your friend, then you're my friend
with
If you're my friend, then I'm your friend

They are two entirely different implications.

Let's let
p = It will rain today
q = I will bring my umbrella

p -> q means "p implies q", meaning "if p is true, then q is true"
If it will rain today, I will bring my umbrella.

q -> p means "q implies p", meaning "if q is true, then p is true"
If I bring my umbrella, it will rain today.

The two are not the same and thus aren't equivalent. I think you might be confusing them with double implication:

p <-> q means "p if and only if q", meaning "p is true whenever q is true, and vice versa".
I will bring my umbrella if and only if it will rain today.

See, boolean logic is fun!
The Beer Monocle. Classy.
• jflynn
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May 30th, 2008, 9:13 am

p = Not a fan of this thread
q = won't open this thread again

p + q = ME
Stand Up! STand Up and Shout!
• Snow is on Fire
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May 30th, 2008, 9:22 am

jflynn wrote:
p = Not a fan of this thread
q = won't open this thread again

p + q = ME

Not a fan of this thread Plus Won't open this thread again Equals jflynn

So... does that mean if someone doesn't like this thread and won't open again they get jflynn?
• Don2007
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May 30th, 2008, 5:22 pm

No, it means that if someone else doesn't like the thread and won't open it again, jflynn could be his friend but it doesn't mean that he will be a friend of jflynn. At the same time, if another person doesn't like the thread but still might open it again just to see what else has been said, then jflynn might not want to be his friend and wouldn't care if he wanted to be a friend of jflynn. In any case, I think if there are a lot of replies, jflynn might absorb more chi using his yin form and open the thread again.
How do you know when a politician is lying? His mouth is moving.
• George L.
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May 30th, 2008, 6:33 pm

Don2007 wrote:
No, it means that if someone else doesn't like the thread and won't open it again, jflynn could be his friend but it doesn't mean that he will be a friend of jflynn. At the same time, if another person doesn't like the thread but still might open it again just to see what else has been said, then jflynn might not want to be his friend and wouldn't care if he wanted to be a friend of jflynn. In any case, I think if there are a lot of replies, jflynn might absorb more chi using his yin form and open the thread again.

//spork I'm still trying to get what you meant in your latest post.

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