※ 引述《Dirac (拉拉)》之銘言：
: . .
: 一般而言，L(q, q, t)中的q、q、t被視為independent variables，究竟是為什麼？
: . .
: 在動力學中，q、q不都是t的函數嗎？而且q和q視為獨立也難以給出滿意的解釋。
: 請教各位。
我回宿舍剛好有一本書有給一個不錯的解釋
Analytical Mechanics Louis N Hand
http://www.goodreads.com/book/show/309669.Analytical_Mechanics
p.14 1.5節前三行 (goole book 竟然沒這一頁><)
http://books.google.com.pe/books?id=1J2hzvX2Xh8C&printsec=frontcover&hl=
en&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
自己縮吧
By generalized velocities,we mean the set of all first time derivatives
of the q_k. We can regard q_k(t) q_k'(t) as independent variables. They are
physically independent since we have independent control over the starting
values of q_k(0) q_k'(0).
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