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A Proof That 2 = 1:
let x=y:
X = Y
multiply by x on both sides:
X*X = XY
subtract y*y from both sides:
X*X - Y*Y = XY - Y*Y
factorise:
(X+Y)(X-Y) = Y(X-Y)
divide by (x-y) on both sides:
(X+Y) = Y
replace x with y:
Y+Y = Y
factorise:
2Y = Y
divide by y on both sides:
2 = 1
Where lies the flaw in the logic?
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