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- #1

- Mar 5, 2012

- 8,796

That is, proofs that we know cannot be right, but where it's not immediately (too) obvious what the problem is.

If you have one of your own that you feel like sharing, please post it!

I'll start:

\begin{array}{rcl}

x&=&(\pi+3)/2 \\

2x&=&\pi+3 \\

2x(\pi-3)&=&(\pi+3)(\pi-3) \\

2\pi x - 6x &=& \pi^2 -9 \\

9-6x &=& \pi^2-2\pi x \\

9-6x+x^2 &=& \pi^2-2\pi x + x^2 \\

(3-x)^2 &=& (\pi-x)^2 \\

3-x &=& \pi -x \\

\pi &=& 3

\end{array}

Please feel free to share one of your own!