quick notation question Watch

jenny0502
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#1
Report Thread starter 10 years ago
#1
I'm just wondering how you would write a negative statement..

so. there exists no value x such that....

could one use the symbol for 'there exists' with a line through or is there a better way?

thanks
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Totally Tom
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#2
Report 10 years ago
#2
that is the standard way.
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DFranklin
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#3
Report 10 years ago
#3
You can also .

say "for all X" and invert everything afterwards; for example:

"there is no X such that ABC is true" becomes
"for all X, ABC is false"

But in general, it's simplest just to use \not\ exists.
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