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## Main Question or Discussion Point

Don't exist formula for the eigenvectors, all right!? Eigenvectors needs be found manually, correct!?

But and about the Mohr's circle? This physical/mathematical theory don't define clearly the direction of the eigenvectors (called principal direction) with the eigenvalues (called principal stress)?

https://en.wikipedia.org/wiki/Mohr's_circle#Mohr.27s_circle_for_a_general_three-dimensional_state_of_stresses

But and about the Mohr's circle? This physical/mathematical theory don't define clearly the direction of the eigenvectors (called principal direction) with the eigenvalues (called principal stress)?

https://en.wikipedia.org/wiki/Mohr's_circle#Mohr.27s_circle_for_a_general_three-dimensional_state_of_stresses