Hi, I'm a new learner of CM and I was stuck at the very beginning. TT(adsbygoogle = window.adsbygoogle || []).push({});

The transformation equation isri=ri(q1,q2,...,qn,t)

I wonder whytshould be in the bracket.

Aren'trdetermined by these independent coordinates？ Isn'ttalready contained in them?

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# A learn's puzzle on transformation equation

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