et q1, ..., qn be a set of independent generalized coordinates for a system of n degrees of freedom, with a Lagrangian L(q, q˙, t). Suppose we transform to another set of independent coordinates s1, s2, ..., sn by means of transformation equations qi = qi(s1, ..., sn, t), i = 1, ..., n Show that if the Lagrangian function is expressed as a function of sj, s˙j, and t through the equations of transformation, then L satisfies Lagrange’s

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Let q1, ..., qn be a set of independent generalized coordinates for a system
of n degrees of freedom, with a Lagrangian L(q, q˙, t). Suppose we transform to another set of independent coordinates s1, s2, ..., sn by means of transformation equations
qi = qi(s1, ..., sn, t), i = 1, ..., n

Show that if the Lagrangian function is expressed as a function of sj, s˙j, and t through the equations of transformation, then L satisfies Lagrange’s
equations with respect to the s coordinates:


d/dt (∂L/∂s˙j) − ∂L/∂sj = 0.


In other words, the form of Lagrange’s equations is invariant under a point
transformation.

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