I can't find the error here
! Missing delimiter (. inserted).
\sum_j \left{Q_j - \left[ \frac{d} {\text{d}t} \left(\frac{\partial T} {\partial \dot{q}_j} \right) - \frac{\partial T} {\partial q_j} \right] \right} \delta q_j = 0
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Use \left\{ \right\{ instead of \left{ \right{
$\sum_j \left\{Q_j - \left[ \frac{d} {\text{d}t} \left(\frac{\partial T} {\partial \dot{q}_j} \right) - \frac{\partial T} {\partial q_j} \right] \right\} \delta q_j = 0$
Hope it works.
Saravanan
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it works, but why can I use \left( and \left[ but not \left { ? – Michaelangelo Meucci Dec 24 '19 at 12:49
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Refer the following link https://tex.stackexchange.com/questions/34580/escape-character-in-latex/34586#34586 – Saravanan Dec 24 '19 at 13:01