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Re:How to Turn Physics into an Optimization Problem by madhadron on Tuesday November 05, 2019 @05:42PM (#21457555)
I usually see is q for position, p for momentum, and a for acceleration. But that might be too much time in Landau and Lifshitz.
Re:How to Turn Physics into an Optimization Problem by evanb on Tuesday November 05, 2019 @06:36PM (#21458083)
This is relatively standard notation.

To be very attentive during an exercise in Lagrangian-formulated quantum mechanics you had better make sure to dot your qs and cross your hs.