How can I find the matrix representations corresponding to complex numbers and quaternions with the help of SageMath <https://www.sagemath.org/>, i.e., the ring isomorphism <https://en.wikipedia.org/wiki/Ring_isomorphism> from the field of complex numbers and quaternions to the rings of corresponding matrices, respectively, as described here <https://en.wikipedia.org/wiki/Complex_number#Matrix_representation_of_complex_numbers> and here <https://en.wikipedia.org/wiki/Quaternion#Matrix_representations>?
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