Axes of Symmetry for Ellipsoid

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Theorem

Let $\EE$ be an ellipsoid.

Then $\EE$ has exactly $3$ axes of symmetry:

the major axis of $\EE$
the mean axis of $\EE$
the minor axis of $\EE$.


Proof

From:

Major Axis of Ellipsoid is Axis of Symmetry
Mean Axis of Ellipsoid is Axis of Symmetry
Minor Axis of Ellipsoid is Axis of Symmetry

we have that these diameters of $\EE$ are in fact axes of symmetry.


It remains to be shown that there are no more.




Sources