Review of my T-shirt design I'm a graphics guy and a wanna-be mathematician. Is the T-shirt design below okay? Or if there's a bone headed error, I'd appreciate a heads up.

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Yet another pleasing way to write the sum:
$$
\left. \pi^2\big /12\right. = \sum_{n=1}^\infty (-1)^{n+1}\big/n^2 
$$
say, if you wanted to take more horizontal space.
