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| − | ==Proof==
| + | #REDIRECT [[Fallacy#2=1]] |
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| − | 1) <math>a = b</math>. Given.
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| − | 2) <math>a^2 = ab</math>. Multiply both sides by a.
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| − | 3) <math>a^2-b^2 = ab-b^2</math>. Subtract <math>b^2</math> from both sides.
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| − | 4) <math>(a+b)(a-b) = b(a-b)</math>. Factor both sides.
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| − | 5) <math>(a+b) = b</math>. Divide both sides by <math>(a-b)</math>
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| − | 6) <math>a+a = a</math>. Substitute <math>a</math> for <math>b</math>.
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| − | 7) <math>2a = a</math>. Addition.
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| − | 8) <math>2 = 1</math>. Divide both sides by <math>a</math>.
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| − | ==Error==
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| − | The quantity of <math>a-b</math> is <math>0</math> as <math>a = b</math>, since one cannot divide by zero, the proof is incorrect from that point on.
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| − | Usually, if a proof proves a statement that is clearly false, the proof has probably divided by zero in some way.
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