On the exponential of matrices in<i>su</i>(4)
On the exponential of matrices in<i>su</i>(4)
This note presents explicit formulae for the exponentials of a wide variety of matrices which are 4x4, anti-Hermitian. Easily verifiable conditions characterizing when such matrices admit one of three minimal polynomials are also given. Essential use of the algebra isomorphism between real 4x4 matrices and the tensor product of the …