Consider the 2 x 2 matrix defined by where a 0 is a real number and a
Question:
Consider the 2 x 2 matrix defined by
where a0 is a real number and a is a three dimensional vector with real components.
(a) Prove that U is unitary and unimodular.
(b) In general, a 2 x 2 unitary unimodular matri x represents a rotation in three dimensions. Find the axis and angle of rotation appropriate for U in terms of a0 , a1, a2, and a3.
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