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Code:

`\left(\frac{\partial \mathcal L(a_1,…a_n, …;\dot a_1,..,\dot a_n, …;t)}{\partial a_i}\right) - \left(\frac{d}{dy} \frac{\partial \mathcal L(a_1,…a_n, …;\dot a_1,..,\dot a_n, …;t)}{\partial \dot a_i}\right) = 0 \quad \text{for } i = 1, \dots, n, i \neq j`

The above equation works on this form but won't work on my wordpress blog (see Lagrangian Mechanics and The Heat Equation), and it won't work on http://www.climateaudit.org/phpBB3/viewtopic.php?f=4&t=766&p=14997#p14997 [Broken]. Is there any useful tools for debugging latex equations? If anyone is curious the above equation is the Eular Lagrange Equation.

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