# On doit trouver une expression pour la longueur de la corde l(s

(1)

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sn

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(2)

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(2)

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12

s=sn

2

s=sn

2

12

s=sn

∂l(sn∂s,snn+1)

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(3)

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(3)

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t1

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(4)

(1)

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(1)

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∂qk∂Qk

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(5)

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∂G∂P(~q, ~P)

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∂G(~∂qq, ~kP)

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