Mary Layne Boas, Mathematical Methods in the Physical Sciences 3rd edition (Wiley, 2005)


Chapter 3. Linear Algebra

Section 7. Linear Combinations, Linear Functions, Linear Operators


For the matrix, find its determinant to see whether it produces a rotation or a reflection. If a rotation, find the axis and angle of rotation. If a reflection, find the reflecting plane and the rotation (if any) about the normal to this plane.


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쉽네요

It's easy, simple, straightforward, effortless, uncomplicated, undemanding, not difficult.