Part 20: On the structure of non-invertible 4D complex numbers.

In general it is rather hard to find non-invertible 4D complex numbers because the determinant is non-negative everywhere. Just try it yourself, write down just one 4D complex number that is non-zero and not invertible. That is not an easy task, after some time you will find some but do you have all? But if … Continue reading Part 20: On the structure of non-invertible 4D complex numbers.

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