# Difference between revisions of "Proof that 2=1"

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==Error== | ==Error== | ||

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. | 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. | ||

+ | |||

+ | Usually, if a proof proves a statement that is clearly false, the proof has probably divided by zero in some way. |

## Revision as of 00:57, 3 February 2020

## Proof

1) . Given.

2) . Multiply both sides by a.

3) . Subtract from both sides.

4) . Factor both sides.

5) . Divide both sides by

6) . Substitute for .

7) . Addition.

8) . Divide both sides by .

## Error

The quantity of is as , since one cannot divide by zero, the proof is incorrect from that point on.

Usually, if a proof proves a statement that is clearly false, the proof has probably divided by zero in some way.