Omni (November 1979)
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Proof that 2=1
1) X=Y ; Given
2) X^2=XY ; Multiply both sides by X
3) X^2-Y^2=XY-Y^2 ; Subtract Y^2 from both sides
4) (X+Y)(X-Y)=Y(X-Y) ;Factor
5) X+Y=Y ;Cancel out (X-Y) term
6) 2Y=Y ;Substitute X for Y, by equation 1
7) 2=1 ; Divide both sides by Y