What symbol do you use for "contradiction"?

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  3. What symbol do you use for "contradiction"?

User Info: Slime_Knight

Slime_Knight
6 years ago#1
We had a topic about which proof mark people use a while ago, and I was just looking at the common contradiction symbols used on http://en.wikipedia.org/wiki/Contradiction#Symbolic_representation . After doing a logic course I pretty much settled on "up tack" (http://www.fileformat.info/info/unicode/char/22a5/index.htm), probably mainly because it's easy to write.

User Info: Xshortguy007

Xshortguy007
6 years ago#2
I use the two implication arrows facing each other.

http://www.ccc.commnet.edu/grammar/ or www.dianahacker.com/rules

User Info: linkkhalid89

linkkhalid89
6 years ago#3
I've seen $\perp,\nleftrightarrow$, as well as two which don't show up in the LaTeX script. But I would use $\Rightarrow\Leftarrow$, although I just generally write "this is a contradiction."
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User Info: PaulMalucciMD

PaulMalucciMD
6 years ago#4
Lightning bolt.
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User Info: Palex3

Palex3
6 years ago#5
[This message was deleted at the request of the original poster]

User Info: Palex3

Palex3
6 years ago#6

From: PaulMalucciMD | #004
Lightning bolt.


This.
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User Info: Sir_Bahamut

Sir_Bahamut
6 years ago#7
If I'm writing down nicely and neatly I just write "contradiction" or "which gives the required contradiction" or something.

I've gotten quite fond of the lightning bolt for shorthand lately though
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User Info: avsfan33

avsfan33
6 years ago#8
I just say it. I try to find a good balance between text and symbols.
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User Info: Slime_Knight

Slime_Knight
6 years ago#9
I usually say it, but sometimes it's nice to have shorthand.

User Info: Appleframer

Appleframer
6 years ago#10
If I don't just say it, then I'll use the arrows:

-> <-
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