- #1

dRic2

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Shouldn't it be ##a_{ik}q_iq_k - \frac 1 {\lambda} (b_{ik}q_iq_k-1)## ?Our problem is to find the stationary value of ##a_{ik}q_iq_k## under the auxiliary condition the we move on the surface ##b_{ik}q_iq_j = 1##.

We drop the auxiliary condition and minimize ##a_{ik}q_iq_k - \frac 1 {\lambda} b_{ik}q_iq_k##.

(Summation convention is used)

Thanks Ric