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Ok, this is as close as I am able to get: Failed to parse (unknown error): \left[ \begin{array}{c} r_{0} \\ \phi \\ z \end{array} \right]\; =\; \left[ \begin{array}{c} 3+\sin t+\cos u \\ 2t \\ \sin u+2\cos t \end{array} \right],\; t=0…2\pi ,\; u=0…2\pi

Dread Lord CyberSkull ✎☠ 09:47, 30 September 2006 (UTC)

Nevermind, I found the example file. Dread Lord CyberSkull ✎☠ 09:49, 30 September 2006 (UTC)