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.
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Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): ellipsoid
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): ellipsoid