american fuzzy logic; A and notA = you get nothing and like it

Santa Rosa CA

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https://math.stackexchange.com/questions/775273/contradiction-prove-22-5 math.stackexchange.com/questions/457490/22-5-error-in-proof already covers this question. – JB King Apr 30, 2014 at 5:26 3 By the way, it's easy to find mistakes in this sort of reasoning: just evaluate each line, one by one, and see where the expression switches from being equal to 4 to being equal to 5. – 6005 Apr 30, 2014 at 5:28 8 To summarize the answers, the point is that x2−−√≠x. Few high school students seem to realize this fact. (Ask a high school student to solve the equation x2=4 and at least half of them will say "take the square root of both sides to cancel out the square, so x=2.") What's true is that x2−−√=|x|. The equation x2−−√=x holds only when x≥0. – symplectomorphic Apr 30, 2014 at 5:32 BOOlean