The Cayley-Hamilton Theorem can be used to express the third invariant of the characteristic polynomial obtained from the non-trivial solution of the Eigenvector/Eigenvalue problem. I follow the proof (in Chaves – Notes on Continuum Mechanics) down to the following equation, then get stuck at "Replacing the values of I(adsbygoogle = window.adsbygoogle || []).push({}); _{T}and II_{T}with those in 1.269. Could someone please explain? Thanks

with 1.269 being:

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# I Third Invariant expressed with Cayley-Hamilton Theorem

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