I have an(adsbygoogle = window.adsbygoogle || []).push({}); Amatrix with dimensions1x1. Its the only termais an arbitrary number._{11}

For what values ofa, this_{11}Amatrix is;

- Diagonal
- Upper triangular
- Lower triangular

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# How do I check if a 1x1 matrix is diagonal, lower/upper triangular?

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