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→The Principle: Spelling, grammar, and general fixes, typos fixed: ie, → i.e.,
Suppose we accept both of the statements "red is a color" and "red is not a color" as true.
Suppose we accept both of the statements "red is a color" and "red is not a color" as true.
Since "red is a color" is true, at least one of the two statements "red is a color" and "Obama is a competent president" is true, and so the single statement "red is a color, or Obama is a competent president, or both" is true. Since we know "red is not a color" is true, the only clause in "red is a color, or Obama is a competent president" which can be true it the latter, ie, "Obama is a competent president."
Since "red is a color" is true, at least one of the two statements "red is a color" and "Obama is a competent president" is true, and so the single statement "red is a color, or Obama is a competent president, or both" is true. Since we know "red is not a color" is true, the only clause in "red is a color, or Obama is a competent president" which can be true it the latter, i.e., "Obama is a competent president."
From the false assumption "red both is and isn't a color," we have reached a false conclusion.
From the false assumption "red both is and isn't a color," we have reached a false conclusion.
[[Category:Logic]]
[[Category:Logic]]
[[Category:Obama Criticism]]
[[Category:Obama Criticism]]