Attachment 22004

I attached a picture of the proof. Any help is appreciated!

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- Aug 8th 2011, 04:48 PMCrayolaIS this proof valid or invalid?
Attachment 22004

I attached a picture of the proof. Any help is appreciated! - Aug 8th 2011, 05:46 PMPlatoRe: IS this proof valid or invalid?
- Aug 8th 2011, 06:04 PMCrayolaRe: IS this proof valid or invalid?
- Aug 9th 2011, 12:57 PMCrayolaRe: IS this proof valid or invalid?
- Aug 9th 2011, 01:26 PMPlatoRe: IS this proof valid or invalid?
On the set of all real numbers, let mean “x is positive”.

means “Some real number is not positive”. Literally, “It is false that all real numbers are positive”.

Whereas, means “No real number is positive”. Literally, “All real numbers are not positive”.

Now can you answer the question? - Aug 9th 2011, 02:48 PMCrayolaRe: IS this proof valid or invalid?
Okay, thank you!