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Re:what is " principal axes "? -_- thanks~

Posted by frkstyc at 2007-12-30 15:08:52 on Problem 3474 and last updated at 2007-12-30 15:11:18
In Reply To:what is " principal axes "? -_- thanks~ Posted by:Sudoku at 2007-12-30 15:02:32 
Consider the ellipsoid decided by (x/a)^2+(y/b)^2+(z/c)^2=1, its pricipal
axes are exactly the x-, y-, and z-axes. When it is translated and rotated,
the pricipal axes move accordingly.
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